Netstar Complete Incompetence and Poor service

I had an Acc with Altech Netstar which was running on a month to month for a Toyota Corolla (CJ99SJGP) which l traded in for another vehicle in February 2023. Prior to trading in l did inform Netstar of the trade in and asked them to cancel the CJ99SJGP contract and move it over to the new vehicle Toyota Corolla Cross. All was agreed but to my surprise Netstar continued to bill me and giving me calls of the Acc in arrears for the car already not with me. I then phoned one of their agents in frustration in March and they confirmed that the account has been closed and l don’t owe anything, now 6 months letter am still receiving calls and emails smses that l am in arrears and that my Acc has been handed over. This is incompetence at its very best really nonsense and if they continue in this manner then will also have to move the current Acc to another tracking company because l really cannot take this frustration anymore, l have really had enough of this Netstar incompetence 😥😥😥😥😥😥😥😥😥😥

(Dear Netstar Client, Due to non-payment your account is handed over to PRE-LEGAL. Urgently pay R388.68 at ABSA *** ***. Call us ***)