Netstar want to negatively affect my credit record

I paid for my tracking device 3 years in advance when I purchased the vehicle in 2022 but I keep getting emails that I am owing and my account has been handed over for collections. This happened last year whereby I had no tracker as my account was suspended for about 9 months until March this year when it was sorted after a long struggle. In July this year same scenario, I’m getting emails that I’m owing again. I’ve sent emails and made phone calls but no help. Now I’m getting communication from attorneys and this thing is going to negatively affect my credit record for absolutely no reason.