Terrible Service

My brother has a cell c account which I pay for as I use the number. The account was originally with Nashua Mobile then migrated to Glo Cell and then migrated again to Cell C. Ever since the account migrated to Cell C I have been making payments to Cell C with the Reference number that Glo Cell provided me with. This month however I made payment as usual and received an sms on the 10th stating that the account is in arrears. I called the call centre and was told that they can't speak to me as I am not the account holder. But I can forward proof of payment to ********** with my cell number as reference. I did this. However my services have been suspended due to non-payment. I have contacted my brother and he called the call centre and was asked to send proof of payment. Nobody even bothers to call him back. When he called back he was told that the payment hasn't cleared from my bank. I then contacted my bank and they told me payment was cleared and they sent me proof of payment again. We sent that to cell c as well with no response. My brother called again and was told that he needs to take the proof of payment along with his ID Document to his nearest Cell C store then they will only unblock the line. With the reasoning that anybody can say they paid and in the mean time they haven't paid. How has all my other payments made to cell c picked up in the past yet this payment is not being picked up? And why should I be disconnected due to Cell C's incompetence?