CarTrack - DISGUSTING service for loyal and good paying client !

I have been a loyal and GOOD paying client of CarTrack since 2010. Had their unit installed in my Toyota, Merc & BMW as I've changed cars over the years. Jan 2021 I cancelled with CarTrack for financial reasons but still had 6 months left of my contract period. They said I can pay the contract off over a period of 6 months. Three months into paying off the contract period, they started phoning me saying "dont forget to pay" but that would be AFTER my debit order would go off ! Then they got their attorneys to phone me in month 4 and 5 & started sending me overdue arrears letters !!!! Then month 6 they sent me an sms saying they have BLACKLISTED me ! My 6th and final debit order payment went off beginning of Aug 2021. I am DISGUSTED in how they have handled my acc. I was NEVER in arrears with them & all I was doing was paying my contract period off but they had the cheek to phone me, get their attorneys to phone me, e-mail me arrears letters & then threaten with me BLACKLISTING !!!!! I will be in the market to buy a new car next year for my daughter but I can guarantee, Cartrack will NOT get my business when I am ready to install a car tracking unit !