DIDNT DEBIT

I have a contract with Vodacom which will expire next year February or march ,now they have been debiting every month until October 2015 ,I don't understand why they didn't debit on November 2015,i called Metro Lifestyle store in midrand and I was told to call *** of which I did but could go through cos the voice prompts require I punch in the cellphone number which I have a problem with ,the problem is ive never used their contract sim ,ive always used my prepaid vodaom sim,so I don't know the cellphone number .<br> My worry is that they don't debit deliberately and after a few weeks they will be handing me over to lawyers for THEIR DELIBERATE MISTAKE ,theres money in my bank account theres no way they can tell me there wasn't any.