Bullying by Truworths: I paid and closed the account. Stop!

I settled an account I had with them Truworths on the 23 Feb 2017 and closed the account. This year they sent two debt collectors to collect monies from me. I proved to the 1st collector in March 2019 that I paid and closed the account and they left me alone. A new debt collector has now come with the same agenda and I have to prove once again. I feel this is becoming a form of bullying and would like Truworths to sort of their back office out and leave me alone. I will provide proof once again and require them to leave me alone and I hope this time it is for good. I checked my credit profile and noticed that they have loaded this their too. I will prove all this and will demand that they withdraw even the items they put on my profile. Fail Fail Fail!