Unable to cancel contract - Pathetic Service

So my contract terms has now come to an end and have need notified by Vodacom that my contract has now expired. Upon calling in to try get this contract canceled I am met with according to them my credentials or security questions do not match what they have on there side?? yet they take my money every month from the specified bank account with no problems...... I then asked what other information they would need to verify myself as the account holder as apparently my ID number , name and surname , bank and debit date are not sufficient to authenticate myself , I then get the phone put down on me ???<br> <br> They are able to take my money each month with no problem but when I try get some service or want to cancel I get told I do not match the credentials on there system and get hung up on ?? how is this then registered in my name if my details do not match and how are you debiting my account each month if this is incorrect ?? pathetic service and unbelievably un-helpfull.<br> <br> I will be canceling all my contracts with Vodacom and will be looking for an alternative provider.<br>