Not allocating payments correctly

I have been contacting Cell c because of payments that they haven't allocated. They blocked my line and every week 3 to 4 times they phone me requesting payments . I have sent them all proof of payments since January 2023 and still I'm getting phone calls that I owe. They have blocked my line and now I can't even look for work because I cannot make any calls I cannot go on the internet is this fair. They not allocating the payments as they should and I emailed it through to them on more than one occasion. I have asked them to collect they units and pay back my money as they accepting the monies I'm paying but not opening the line. I would like to know what the way forward is as now no one is getting back to me no one is responding on the emails I'm sending and my line is still suspended