SETTLEMENT IS A LIE

I had an account in arrears they offered me a settlement with discount and I paid it sent them the proof and it is more than 2 months no paid up letter. What is worse on my credit profile it shows that I paid the amount of the settlement but I still owe the rest of the money. I have sent more than 10 emails. Called more than 30 times either I am transferred to someone that knows less than the previous one or I am fully hung up on. Today 21 May I have called 4 times and been hung up on 4 times.