Rogues! ****s! Unprofessional Nimble Group

I've had this company contact me regarding a mr.price account, we made a payment arrangement to pay the amounts agreed upon over three months, I paid the first month, and then lost my job for the second month, so when they contacted me regarding payment, I explained the situation and the lady advised that my payment agreement still stands should I make 2 payments within the 3rd month (1 at the beginning of the month, and one at the end of the month - to suffice for month 2 lapsed payment, for which I had a valid reason) so as agreed upon, I made the 2 payments over the month of February as agreed upon. Now they're calling me and asking for more payment, I've forwarded proof of payments to them on their email and queried the issue with them via email as well, but the automated response i eventually received was that my ticket was closed, but no one contacted me, and or rep**** to my issue. Im frustrated and absolutely angry with them calling me and demanding payment when I kept to my payment agreement, they said that their calls are recorded and they will go through my previous conversations and see if the payment agreement i made, was actually said to me by the lady that called me, but its been months again, and my issue hasn't been given any attention, or been the slightest bit resolved. This nonsense is affecting my credit record and I've made a 101% effort to clear this account at the agreed time, but it all seems like a waste because this thieving company doesn't care about helping a person clear a debt, or anything.