I went into the shop, and told them what you said @Ockie, so the lady checked and she said that my LTE service wasn't even turned on and because I downgraded my contract I will have to wait until the end of the month for them to be able to turn it on. Why on earth would they do that?
I've had no data problems with signal on my iPhone 8 i.e. streaming music while driving etc up until beginning Dec 2023 when I started getting a lot of completely dead spots, no coverage whatsoever driving exactly the same routes as well as terrible signal at home. I went in to a Vodacom shop...