Bad service and reeks of *****

I opened an account with iSmart in 2014 and in 2017 they handed my account over to GVDM attorneys based in Mpumalanga. I paid and settled the account via these attorneys in March of 2018. 2 months later the same account that had been settled was handed over to another firm and I contacted iSmart to ask what was going on to which I was told the account had been erroneously handed over they do have record that the account was settled. Fast forward to the 23rd of July 2019 I receive an sms from yet another firm informing me that iSmart has given them my account for collection. I called the called the accounts department and I was informed that there was nothing they could do for me unless I provide them with a paid up letter, take into account that this is a year and 2 months later from the time they actually told me that everything was settled. Lucky for me I still remembered the firm that they had used before, I requested the letter again and submitted it as I had previously done I am and sitting here waiting for a response. It is very unfortunate how companies like this carry on trying to de***** people and they have the nerve to tell you that they have no track record of what happened with an account. It is such a big big shame.