Cell C poor service

We have had several contracts with Cell C since they opened in South Africa. For the last 10 months we have been having trouble with billing issues after Cell C billing (accounts) system triple billing their clients. At that point and time the account was up to date. From there on I have experienced endless issues with my account due to payments not being captured and reflected on my statement. Every month I ignored the arrears as per their statement and paid the current account due to their account errors. My services will then be suspended and then I have to resend payment notifications to prove payment. The lines will then be un-suspended and then all is good till the next month and all starts over again. This has been ongoing for the last 10 months. Every month I have to phone and send all proof of payments and at some instances up to 12 months of proof. The last issue happened end of March 2022 were the lines was again suspended. I again went thru the process to proof payment but to no avail as they are adamant that I am still in arrears. I cannot understand that I am 120 days in arrears with 17 months proof of payment sent and 5 months remaining on the contracts. In the interim all the contracts have been cancelled and a additional 11k added to the account statement. I have been sending all the relevant documents to accounts and exclusive@Cellc all the time and every month its a different consultant dealing with the dispute and it never gets resolved!!!! So that is how Cell C treats customers that has been loyal and supporting them from inception in South Africa????