*********** staff can't help me renew my contract.

I have been a customer of Cell C for many years, however, I am now extremely frustrated by their *********** staff. I have been trying to renew my contract since June 16th. I have been to a store in person and I have also called the Customer Care line on numerous occasions. When I visited the Tygervalley store on 16 June, I was told my account shows a missed payment, but the assistant also told me that he could see on the system that it was an error. I pay by debit order every month. He informed me, that as it was a Public Holiday, it could not be rectified immediately, but that it be done on the following Monday. I have since then phoned the Customer Care line numerous times, every time being told that the system still shows the missing payment, but that someone would contact me once it is resolved. Needless to say, this never happened. I made yet another attempt today to renew my contract. I was repeatedly asked for a proof of payment, but no matter how much I explained that I pay by debit order and that I am not in arrears, nor am I able to provide a proof of payment as I don't even know when this so-called arrears occurred. I have already cancelled 2 of my 3 Cell C contracts out of frustration and I now considering moving to another service provider alltohether.