No professionalism

Sometime in June 2018 I received a call from MBD stating that they collecting on behalf of FNB Credit Card. We came to an agreement on the repayments and I kept to the agreement and paid every installment. In December 2018 I get a call from Olivia Hoosain asking me to send them proof of payment, which I did, for what reason, I don't know but I just sent them.

Come January and all of a sudden FNB calls me and tells me that they haven't received any monies from me for my credit card and they are handing over my account to the attorneys.

I sent Olivia Hoosain an email on the 21/01/2019 asking her explain why I'm receiving calls from FNB regarding monies I have been paying to them. She never responded until the 31/01/2019 and her response was "Please note that I do not pick up your FNB Card on our side." after numerous attempts to contact her via email & phone, she sends me this email and that was it. I sent her letters I received from MBD proving that they contacted me and we went into an agreement, I sent these on the same day she responded and as usual it'll probably take her a while before she replies.

I just want my money paid to FNB or paid back to me.