Irritating Phone calls

I really don't understand how these people work.

I had a debt with Capfin and was handed over to the Nimble group for collections, I made a arrangement with these guys for them to debit R300 from my account to repay this debt, I then later received an sms saying if I were to settle my debt I was going to receive a 25% discount, I called them to make an arrangement on the 28th of October I called the company for banking details since non was sent to me by the previous consultant I spoke to, the consultant sent the banking details which were unclear to which bank do I need to pay the settlement, I then called again to confirm the bank and the exact amount that needed to be paid, she the said its Standard bank and I need to pay R3824, I paid that money but still received text saying I need to pay, I called them to clarify this and the person on the other side of the line said I was supposed to pay R3829 that's why my settlement did not update, I explained that the person whom I spoke to said I owe R3824 she then said the calls are recorded and she will get back to after she has investigated the matter. she never got back to me instead I have been receiving calls from different consultants every single day asking me to pay, I decided to call again for feed back, then she said the only thing I can do is to pay the R6 that is outstanding and my account will update withing 24 hours, I did that but still I receive calls everyday telling me to pay my account, It is soo irritating having to explain the same thing to different consultants who call you asking you what happened, I am soo annoyed because now they are taking me back and forth and not resolving this matter, I paid on the 28th but the account is not closed to date, the last consultant I spoke to just now hung up on me, how rude is that. this is soo unprofessional and uncalled for.