Tracker debiting money from non-customer

I have never been a customer with Tracker, but they have been deducting money from my account for months *******ly. They used my bank account details for somebody else's debit orders. After many phone calls and emails they eventually paid me back my R6050 (without interest) a month ago. On the 1st of July they debited again R6295 (the money they owed me PLUS a months service charges) from my account!!!??? Again after many phone calls and emails they promised to pay me back my money within 72 hours. When that time period lapsed they promised that they would pay it back by Monday 6 July. This is now the 9th of July and I haven't even heard back from any operator or manager ensuring me that they are working on this issue. This is after I clearly stated that they need to make sure on a daily basis that my query and payment are being dealt with! Tracker....how is it possible that you just take money from people without them even having a contract with you!? How can it be that you know about this issue and do not respond immediately and on a daily basis to my query!?!?! I am appalled and disgusted by this issue and the absolute lack of professionalism and service.