CELL C *****ING MY MONEY AND DATA

I have had contract With Cell C for a few years. On Friday & Saturday 07/02/20 my phone just randomly started downloading stuff I switched it off with the hope that it would stop but didn't. On Saturday I eventually managed to find out how to take out the sim card. went to Cell C Forest Hill where I was told phone needed updates. In the meantime all my data was used/disappeared and there is a cost of R427.65 for usage. Updated were done - took 4 hours of my time that I had to wait. Phoned Cell C customer serviced on 12/02/20 and was informed that I have to pay the R427.65 as my contract was not capped. when I upgraded in Jan/Feb I made sure to inform the tech that helped me that my phone must be capped at R520.00 per month however This apparently did not happen. I know I signed documents that it was noted that my contract must be capped. The lady I spoke to on 12/02/20 was very ill informed - did not offer to take this up with anyone at all and just said I must pay. WHY MUST I PAY FOR SOMETHING THAT WAS NOT MY FAULT??? i WANT MY DATA BACK AND THE COSTS REVERSED. If they look at my account I never defaulted and never go over R520.00 pm. Cell C customer services is terrible, call centre agents even worse.