Auto and General and Netstar mess!

My previous complaint refers:https://www.hellopeter.com/auto-and-general/reviews/hassles-with-tracking-unit-***

After selling my old vehicle, transferring my Netstar tracker contract to my new vehicle (which premium is included in my vehicle insurance contract with Auto and General) in October 2018, I start seeing debit orders go off my bank account referenced to Netstar in March and April2019. I find this weird because I am paying for the netstar device in my insurance premium with AutoGen. So I phoned AutoGen and they liaised with Netstar. They figured out that Netstar is debiting me for the device on my old vehicle 5 months after I sold it. Netstar apparently did not cancel the contract on the old vehicle. So AutoGen organized for them to refund me and close that account (which was supposed to have closed in October 2018). I get the refund in April 2019 and think all is well. Until another Netstar debit in May, then June and then I phone AutoGen again to inquire and find out Netstar did not close that account again. And all this time I'm thinking how did Netstar get my banking details in the first place when I've always dealt with AutoGen, I did not consent to any Netstar debit so how did they manage to debit my bank account even though all my insurance payments are up to date (remember my tracking unit fee is included in my insurance premium). I get reassurance in June that the old vehicles tracking unit account is indeed closed and Netstar will refund me the May and June amounts again (all this time the debit order amounts ranged between R117 and R234 per month) then in July Netstar debits me an amount of R917... now I've lost all my patience with both Netstar and Auto&General! I dont know what to do. I can always block Netstar on my banking app to prevent further debits, but what if they continue to try and debit me and list me as a defaulter when in fact I have no dealing with them? My credit record will be compromised? I'm frustrated