Being Handed Over and not informed

I have 2 contracts with Cell C. One taken in September 2013 & the other in December 2014. My husband who does not even have a contract with Cell C received an SMS yesterday stating that I will be handed over for non-payment of an account.<br> <br> The contract that was taken in September 2013 is up to date and in order with the payments being made via debit order. The contract taken in December 2014 is the problem, they have the incorrect banking details on their system, I dont even know how they got those banking details, when I called to enquire about it & had them change the banking details to the correct banking details, clearly this did not happen, I called again to advise them that they have the incorrect banking details and still not captured on the system, I contacted the call centre yesterday & spoke to a Bongiwe who was relatively helpful and she said she will call me up at 12:00 today to clarify this issue, she has yet to call me back.<br> <br> It is completely unfair for me to be handed over for this as I did the necessary to correct the error and I am prepared to pay the outstanding amount.