Canceled rental cell phone

I am very ANGRY WITH YOUR POOR SERIVICES OF PAYJOY, BECAREFUL PEOPLE ,i'm angry what has been done with my name at the credit bureau, this is ***** I NEED URGENT ASSISTANCE ,IM GOING TO TAKE THIS MATTER TO THE LAW INFORCEMENT ,what was done with the sales agent, PROOF WAS GIVEN TO YOUR OFFICERS BUT THE ACCOUNT IS STILL SHOWING ACTIVE ON MY CREDIT REPORT THIS PHONE IS CANCELLED WITHIN THE contract TERMS within 7 days, I returned the cellphone back to the store and handed it over to the sales agent. The agent promised me that he will make sure the contract is canceled but I noticed few months later it was never done. I laid a complaint previously and was contacted by another consultant from Payjoy and was told the matter will be investigated and they will give me feedback which was never done. It shows that I owe them money on the credit bureau of a phone which I returned back to the store. This is ***** against my name. If this matter is not resolved I'm taking it further.