Confused Client

Hello, My name is Zuqaqambe Ndayi. I have an account with Jet but it was to Nimble and now is with Norton Lambrianos Attorneys. On 27 May 2023 they sent me a text that I should pay R1511.01 discount and my account will be paid in full, and I did. However, my account is still very activate and incurring interests, and I haven't received my paid-up/ settlement letter. My credit score is very low, and have a really bad credit record which makes it hard for me to get employment. Please fix this I cannot go on like this.