******* debit order under different names

I took out insurance with dotsure, Dotsure arrange netstar tracker to be placed in my car, on behalf of client. Now about 3 months ago I cancelled my dotsure insurance and I told them to make sure to cancel netstar. My netstar agreement had expired, 36 months, long time ago. So I take it it is month to month. Because it seems like netstar can't communicate with clients. 2 months ago first debit order R145 went off on a name I dont know. Realising it is netstar, again this month it went off R290. During all this I send emails to communicate but no one has called me or email me back. This is ********** activity because I did not give netstar the right to put debit order in place. I did cancel it thru my insurance and email netstar. I also told you in email I am selling the car, nothing happened. My bank also said that if it happens again I must talk to there ***** unit as this is irregular activity