Settlement discount not linked to my balance and account not cleared

Am very disappointed by even writing this review to nimble group. I made payment arrangement for my account that was on arrears due to hospitalisation and recovery that took more than a year. I did arrange to pay R329.29 for the remaining balance, in October or November I got a settlement amount that's giving me a discount of close to R140. I had to pay a sum of 523.89 before end of November I did pay the amount with the hope that I will settlement one credit I had. To my surprise that same day the agreement amount of 329 was also deducted from my bank. I did escalate my refund which I got some whr late January. while awaiting to request me settlement letter consultants started calling me requesting a settlement to my account that I paid only awaiting my letter. I realised on February that my account was not updated since I paid the settlement amount that I got n used their link to pay for it. Today 25 February I called again n I was told that my account is handed over to another agent for collection. How, when, where is my settlement letter. Worse part the payment agreement was to be concluded in December the was no deduction that was made. I logged more than 3 calls regarding the matter no one got back to me but today my account is handed over to some agent. Nimble group can u please update my account as u gave me settlement amount I paid within the period given.