Clueless and confused call center agents

The agents from this company are the worst and most confused agents I have ever had to deal with. These people are confused and don't even know what they are doing or what is happening in their company. MTN handed over my wife's contract that was in arrears to them for collection. We had an agreement to set up a debit order to settle the account; the debit order went through, but these idiots keep calling and asking us to provide them with proof of payment for money they collected via debit order from our accounts.

We have received calls from different agents every day. One agent claims that everything has been paid and we'll receive the settlement letter within 40 days, but the very next day another agent claims that they have not received the debit order payment.

We have provided proof more than five times that shows that we paid everything they said we were owed, but again, some agents claim not to have received this while others claim to have received it, and our account is closed.

These guys are clueless and confused with their work.