Connack Muller & Co administration

FNB handed over my loan to Connack Muller & Co attorneys and they started to harass me for payments although, I was unemployed in 2018, made some arrangements for payments which I did tried all my best to make some payments, I requested some last statement since I have been paying, only to find out no changes on the loan since I started to pay but instead interest going up, so I have been paying Connack Muller & Co administration, to my loan which I doubt, if this an agreement between FNB and Connack Muller & Co,