FAIL: MWEB uncapped -> Axxess uncapped -> Cybersmart.
Wow you're a sucker for punishment. From good, to bad, to the worst. Stay away from Cybersmart, for your own good. MWEB definitely have the best uncapped products in the market. Are you one of the abusers in the top 5% that all the ISPs hate? What's your monthly usage like?
Perhaps the problem is not with your ISP, but your line, or your modem? Have you eliminated these as potential culprits (irrespective of what each ISP says).
Sign up for a free 1GB unshaped account from Afrihost, if they're still available -
http://www.afrihost.com/site/page/free_1gb_adsl_account.
Test it out and see if you like it. Personally, Afrihost capped data works the best for me. It's the fastest, has the best latency, and has the best price. Perhaps you should consider a 10 GB account from Afrihost. This might suit you better than uncapped.
Also, remember that MWEB cut it's peering links with all local ISPs who do not peer with them openly and freely. They are no longer paying for local transit. That means those ISPs that currently don't peer with MWEB, will have their local data routed internationally, and then back to RSA. This will double or triple the latency for certain websites and gaming servers, depending on which ISPs networks these servers are hosted on.
So the issue might not even by the shaping or the FUP. Some ISPs respond to all claims of slow speeds with some BS about exceeding the FUP. Don't trust what they say, unless they can show you hard evidence that you've done so. Do your own investigations.