Terrible Service! *********** Staff.

I made a payment to CELL C on the 28 August 2015 I then sent through proof of payment and received an email to advise proof of payment has been received. A week later my line was suspended I call the call centre and they advise that my account is outstanding and I asked the lady to please explain she says she is unable to assist but they can debit my account or I can go in store, I try to explain I have paid and received an email that payment has been received. I requested her email address to send through proof of payment and she said that she cannot provide that. I then forward my email to CELL C again and get another response that it has been received however the line is still suspended!! I call again and the call centre agent says my account is outstanding and it could be that the system is slow and they haven't managed to allocate the payment. That is really not my problem!! She was not able to assist me and told me I must call back. I can't understand how difficult it can be to allocate a payment to an account.