Worst service I have ever received

The customer service is the worst in the world. They do not have ANY client skills. on the 31st of January my debit order went off. The amount debited was not my monthly premium. R1486.63 was added. I immediately went to my statement to see why. I then saw that I have not received my statement for the past 2 months. On the 1st of February I called in for the first time to the Call Centre to hear why they have deducted more than my current debit amount. No one could give me a answer. (I later learned that the case was resolved on the 4th of Feb without consulting me as to why) after multiple calls on a daily basis I still had no answer as to why more money was deducted each consultant had other story as to why. One of the consultants told me it was because of my December premium didn't go through. i have sent my bank statements 3 times just to know it was not that. the other one told me it was because of my update I did in December, which is also not true, I have asked them for the signed contract of the upgrade which they couldn't provide. The other story is because I did an early upgrade in October 2022 and did not pay the commitment Which is also not true because I did the upgrade a month before the contract ended. I have asked each and every call that was made to speak to a manager or supervisor but "They will call you back" was the response. Only on the 23rd of March a supervisor contacted me - He PROMISED me he would get back to me the same day, which also didn't happen. late afternoon on the 24th of March another supervisor told me the ACTUAL reason (almost 2 months later). It was of a commitment not payed in April 2021 - Which is also not true, I have sent in my proof of payment to them. Now it was said that Cell C wrongly allocated my commitment that was payed towards my bill. and should have deducted my commitment on May 2022 - but now almost a year later they deduct the money without consulting me or without my permission. and it took them 2 months to get a straight answer. The keep billing me now for additional fees because I reversed my debit order because of them taking 2 months to say why they deduct more. My credit score has now been affected because of this. I have asked for a consultant from the payment arrangement to contact me but still no one is contacting me. I have asked them to remove my debit order and that I will pay strictly every month via EFT but they are refusing me. I have asked for all my recordings from the 1st of Feb 2022 but they are also refusing to send it to me - or they say they will send it but is not doing so, and has excuses to do so. They also keep resolving the cases I log without any feedback to me. What am I to do now?