Incompetence at its best

We wanted to take out 2 cellphone contracts from Telkom Mobile. We received one, but the other was out of stock and we were told to wait. We waited a month, phoning and going back into the store at least 1-2 times per week, still no stock. We asked if we could receive a prepaid sim in the meanwhile so we at least have a number but asked them if it would be fine to keep that nr and just transfer it onto a contract once they receive cellphone stock, they assured us its fine. last week they receive 5 phones so we take the sim in to collect our phone and link the sim to the new contract. their HO refuse to do it, they say its cant be done and its too complicated to do?!After they ASSURED us it can be done. the manager refuses to phone me back. I have a phone, a prepaid sim and still no contract? I have already printed business cards with this nr on, I cannot change my number now!