Just saw your message - I also struggled. And Fastway doesn't answer their chat lines.
I'm in your boat regarding Ozow - if something goes wrong, the bank won't be liable as you gave your login credentials to a 3rd party.
Contact Temu on the support chat if you haven't already tried. They can be quite good sometimes, usually the support staff try their best to be helpful, but they can be limited by unknown factors.
I must have received about 50 deliveries so far. I have learned to be patient because my previous go to was Aliexpress or even Wish.com and those deliveries take so long you forget they're coming. Then you get a random message from the post office that looks like a phishing SMS saying you must pick up your package NOW!!!! Oh, and you have to pay for them bringing it from the EC for you to CT. It really is a sucky experience that you also pay delivery charges on, so to me Temu is a freaken miracle compared to using those systems and I hope it lasts a while so I can stock up on things for my life. Sometimes you can find things cheaper on takealot. Usually if it's very light, you will find crazy bargain deals on Temu. They've set thresholds really low, so I don't know why people are complaining all the time. The delivery service is top notch compared to the others (And Temu is fronting the healthy cost of couriering it to your door via air from China, which they've managed to optimize by making service carriers comply with a huge list of requirements, such as regular reporting of your parcel status) unless you're willing to drop about R1000 - R3000 alone on a one to two-week DHL delivery charge from Aliexpress as they ludicrously charge on so many items. Then things can go wrong and sellers sometimes want to back out after realising they have undercharged on a delivery. It's just outdated and not great - but they do have a much wider selection of products including a lot of industrial things which can be incredibly desirable and useful, even if they are Chinese.
I think it's a good thing having a decent min charge just considering the environmental impact alone of a long range air delivery. If people exploit it, it will have large scale consequences. What pisses me off is that i have vouchers that have a min spend of R300 and R600, but the voucher reduces the total cost, so you still need to buy a min of R856 now to get R200 off, whereas I used to get a33% discount by getting as close as I could to R600, and only spend R400 in actual cost. The R100 off R300 also then becomes R100 off R856, so I wouldn't use it.
If they would let me combine the vouchers it would be no problem. But this and an experience in Fishland where I will need rougly 2 tons of fish food to complete a game (this happened a bit more than half way through the regular length of the normal game, which is already ages). Typically, the feeding rate only reaches this difficult when you are at the end of your last fish. I still need another 14 fish, feeding at 0.02% - 0.01% per 10 grams of fish food. Do the math. It's clearly impossible. Yet the customer staff are and temu bot implore you to keep going and invite more friends! lol. Not great life advice to be giving.
So the only thing I can do is try and create a new account and start again.
I've already won farmland and fishland three times over two accounts so maybe Temu have had enough of handing me free prizes and vouchers that have wasted so many people's time and energy. One of my accounts has blocked farmland. I find farmland a bit quicker, but everyone's experience seems to vary. It's weird, to say the least.
Usually, I would add another order right after the first I used a coupon on, so they could hopefully try combine it before its sent (which usually does happen). So I wouldn't feel too self-conscious about spending R600 and getting R900 worth of already discounted goods. I would consider the savings outweigh the customs cost and actually I still save a bit more on the already heavily discounted prices I'm buying and get reimbursed mystery amounts with the Price Adjustment button. I feel like I've saved myself bucket loads, but at the same time invested way more money that i would have ever been willing to anywhere else because it feels like such a hot and short-lived opportunity... So beware of falling into the trap where you will be paying back credit cards for years if you are ever able to get out of your debt at all, not to mention the other trap of investing your life hours into staring at a screen and repetitively pushing a virtual button tens of thousands of times to get some trinkets.