BAD ATTITUDE VVM CAPITEC DEBT COLLECTORS

This is the worst debt collectors VVM Collections Capitec. They keep on phoning you even if you have made a payment and harassing you. I have not made one default payment since start paying, but these people keep on phoning. Ater sending the POP still they cannot read the POP. So please tell me how training is done, or credit control done. It takes ages for them to allocate payment to account and they just assume that you did not make the payment. Payment date is 28th and then payment is done no default was done.