12 later being billed by MTN after settling.

On the 11/10/2014 I have contacted MTN and arranged for settling my contract with them, the consultant then informed me the amount outstanding was R4666.50 and I asked him again are you sure there are no other costs and he confirmed the total was the above, I went to the bank and settled it then contacted MTN again to confirm and the lady said it was confirmed, today at 4pm a debit goes off from my account it's MTN 12months later, I contacted them and the consultant informs me that I have been receiving packages from them for the past 12months and I explained to her not one package was received on my side otherwise I would've contacted them long ago to find out why I'm receiving the packages if I finished my contract with them.<br> So now after an error from the first consultant with an incorrect total I am now liable for the cost and why wait so long to debit it after 12months.<br> <br> Shouldn't the consultant of 2014 be the one liable for the error or cost?