Taking money from 2 different accounts for 1 devic

On 21 July 2015 I phoned Tracker to do a change of ownership and change of bank details. From my ex husbands account to my account. So the details was given monthly payments was taken from my account. Now my ex husband send me an sms that Tracker has handed him over for a non payment. As they are still debited from his account he stopped the debit order as Im paying for the Tracker now from my account. So I phoned Norman bissett & Ass where the account was handed over and they informed me that there was no payment for Oct on my ex husbands name when they open the profile of the tracker they still gets his details. So I phoned tracker as my ex husband asked me to sort this out as its on my account. OOOOO no they cant help me as he has to phone in for security reasons. So now I want to know how in the hell can they hand him over for something i did change and Tracker is taking the money from my account every month??? So in other words they are *****ing as they deduct from 2 different accounts for 1 tracker device. And then also the amount outstanding from him are R383.68 and I'm paying R216.00 a month, so why are the amount different for 1 device???<br>