Billing me for a service I don't even have

To whom it may concern.<br> My account has been debited by MTN for no reason. I have happily switched over from MTN to Vodacom about 6-7 months ago, then I see that MTN have debited me R1575 and I have no idea why or how? I haven't signed anything or agreed to anything so who authorised this? And I called MTN today and apparently they need to investigate and thereafter it could take 7-14 working days to pay the money back(from after investigation finishes) . I'm sorry but that is my bread butter and that is a lot of money for me, and now I need to wait for them to reimburse me for something that I didn't sign or agree to? <br> <br> Please MTN, please fix this, last time I used hello peter was to complain that you guys took 3 months to cancel my account, and now that the nightmare is finally over you guys just start debiting me for something randomly with no notice whatsoever and for a service that I am not even using? <br> <br> If this can be fixed as soon as possible I would really appreciate it.