Billed for a free service?

I was introduced to 24/7 ASAP via the Tracker SA call centre. I was notified that the service would be on a trial basis and that I would be contacted again by a representative to find out if I would like to continue with their service as a month-to-month paid-for service. It seems that Tracker SA have also divulged my account details to 24/7 ASAP who have already debited my account end-October. Can I please have this resolved by getting my money back and by cancelling this service?