account nightmare

I'm really irritated with Homechoice and these people from SSD, I had some issues making payments on my account as I was unemployed.. They handed my account over to a company called SSD sometime at the beginning of the year, I received calls from them nonstop until August 2022 when I managed to settle the account with a 20% discount.. during September I started receiving calls again from SSD saying that I owe. I told them that I had settled in August and they backed off.. I called in and sent countless emails for an update and a paid-up letter and only around the 1st of November 2022 I receive a "clearance letter" from SSD.. I sent a letter to Homechoice with the proof of payment and asked that they please send me a PAID UP LETTER and that they need to update it on ITC, They told me to wait 21 days, On the 13th of November, I again received annoying calls from SSD. even a letter stating that my account was handed over AGAIN!!.. i called them today and had to go over the same story with the.. the lady told me the account was handed over to them by NIMBLE.... Meaning that Homechoice handed over my account to NIMBLE and they Handed it over to SSD..... I need this situation sorted. if not i will take further action.. This account has really kept me from a lot.