still billing me for a contrat that was cancelled

My wife and I have been battling to cancel her contract on her Samsung tablet for a while now.<br> We have made numerous efforts to do so<br> Several phone calls to the call centre who are useless they refer you to a vodashop<br> as we were told \this type of contract cant be cancelled over the phone\".<br> Personally gone to the vodashop in sandton who first told us to call the call centre.<br> Email to customercare who don't even reply<br> I have even tried the online chat facility ,who referred me back to the call centre.<br> <br> Now we get an email invoice stating that she is now on a 24 month 2 gig contract.<br> please cancel the line and this ******** contract & get out of our lives<br> My cellphone have been with Vodacom for about 15 years but I am now hell bent on<br> moving my account from Vodacom as well"