Netstar attempting to double-bill us at the cost of their inefficiency

I would like to lodge a formal complaint against Netstar wrt Profile/ Account No. ***7, which was a business/ group account registered under the e-mail *** that I managed. Last year we had a co-operative for buying each other cars, and we bought a total 21 cars and had the Netstar Early Warning device installed into our vehicles. The co-operative and all banking accounts were meant to terminate by mid-December 2022. Since the Netstar contract is a 24-month contract we notified Netstar by end of October that the group would be terminating soon and that they were supposed to transfer the individual vehicles' devices ownership to the respective owners. We supp**** them with each member's contact details so that they could get their details and banking details. However, Netstar took long long to make contact and transfer the details and got a few of the guys' details after the date when the co-operative's bank account was closed. They eventually transferred everyone's details and went on to deduct the December premiums, but for one reason or the other they still wanted to withdraw the same funds from the co-operative's bank account(which at the time was defunct). Additionally, they are saying that I owe them R40,138 which is for the remainder of the contract period, also ignoring the fact that they are deducting the same funds from the same members. So, in actual fact they want to double-bill us for their own inefficiency and for not updating their system respectively. I will not go into the operational maladies, which is a meal for another day. Can you please assist in clearing up the confusion and potential ***** that Netstar is attempting to perpetrate.