Do Not Trust Fnb or The Nimble Group

I had an arrears on my FNB checking account and the account got handed over for collection to Nimble Group. I struggled to pay off the areas and the Nimble group offered me a discount of 45% to settle the account. They have sent me sms’s confirming the settlement of 45% I then pay the discounted amount and to my surprise the account has not been settled. I looked at my acc There was still a balance of areas. So was this whole exercise by FNB just to trick me into paying a huge amount into the account? Just my advice to not trust FNB and the Nimbe Group, they have just manipulated me