Not checking up on accounts that have been paid up

In March 2017 I paid up an existing debt with a Drbt Collector ( MBD solutions). They requested that i pay R1240 as a settlement to my Debt with Edgars. The issue 1st started when they did not send through a debit order on the date they had initialy said they would use. I then **** alternative arrangements with them to collect the money and pay my account up as per agreement. I then requested a paid up letter and nothing was sent to my email address and nor was i infomed of the right channel I then needed to follow.

Today ( 23/10/2017) I get a call from a different debt collector stating that I still owe Edgars and I need to state why i have not made any payments since March earlier this year. After the conversation with this new company I then took to the old company to verify what is happening. They confirmed that I have indeed paid the requested amount by EDCON in the month of March and they had sent a request to have my account zero'ed. They lady asked me to then check again on friday to see what was going on, as she would send another request to have my account zero'ed.

This has negatively impacted me, in the sense that, I recently tried to apply for finance for a new vehicle, and got declined. I was told that I was listed by a company. In this time these people have not been paying attention to their accounts and all the details that follows. My name is being dragged in the mud when i have already adhered to their requirements and paid whatever they had requested me to pay.