Dissatisfied Cell C Customer!

I have a few business contracts with cell c, all paid monthly, need to do a sim swop on one of my numbers bought a new sim card and called in to complete the sim swop, as I live in Richards Bay and we don't have a Cell C branch here, closest branch is Durban. Was told by the consultant that she cannot assist me with the sim swop as I have not used the number in question for three months! Excuse me I am paying for the contract monthly, how often I use the number is irrelevant....! My question to cell c is, If you not prepared to assist me with my sim swop so I can utilise my paid contract, please cancel my contract and don't charge me another cent. As far as I am concerned you cannot expect the client to pay for a service if they can not utilise it. I am told I must go into a cell c branch in Richards Bay...... Hello cell c you closed our branch here years ago! Disatisfied customer!