Wrongfull debiting of account

When I bought my Datsun Go I recieved one year free tracker and insurance on my car. The tracker was arranger throught the insurance. a Year later I cancelled the free insurance with oakhusrts and the tracker and joined another insurance. This was at the end of June 2018 and the new insurance commenced 1st of July 2018. On the 1st of July Netstar debited my check account with R290. As I have no buisness with them I stopped the debit order and had the money refunded to me by the bank at my own cost. I have spoken to Bongi at Netstar who blames Oakhusrt and say they never cancelled the subscription with them. I spoke to Nadia at Oakhusrt who never got back to me. I spoke to Warren who just transfer my call to Silvia. Evertime I had to phone their cantact centre, again at my expence as they don't follow up. The receptionist takes very long to answer and each time she expect me to give her a whole explanation of why I request to speak to Silvia. The blame shifting continues. Neither of the two companies take responsibility for this error and I suffer the financial consequences and frustration. This after 12 months of cancellation and no interim communication. They have sent me another sms to rate their service which feels like a joke and another sms to remind me they will be deducting the debit order again on the 15th of July. Is there anybody that can assist from either Netstar or Oakhusrts to resolve this matter?