Cell C terrible service

I have been a Cell C client for very very long. I paid my account on 20 September, which was 10 days earlier than what it was due. I paid on the cell C website after logging in with my details.

It is now 10/10/2023 and Cell C has still not allocated my payment. I have sent the proof of payment numerous times and have received lots off references, but no one has bothered to phone me back.

I am due for an upgrade and when I enquired this week about the different package, I was told I can not upgrade because I am a bad payer. You have no idea how quickly I will cancel my contract and go somewhere else. How is it my fault for you not allocating my payment after sending proof of payment. This better be corrected so that I can upgrade immediately

And dare switch my line off due to "NON PAYMENT". I will make big trouble.