Double debited

I recently upgraded my contract, it was an early cancellation of one contract in order for me to go up to another. But the gentleman at the store promised me that the penalty amount was only suppose to be R2080 once off but then at the end of the month I was debited exactly double that. I've tried to enquire in store, but the manager there just tells me he'll phone me back... Which never happens. I think person who helped me quoted me the wrong fee, but I would never have agreed to it if it would've been R4160. After that same clerk \logged"the fault no one even had the decency to Call to tell me the \""log\"" was denied. Which wasn't my fault because I was initially quoted wrongfully. Please help. I don't feel like Telkom even cares about good business. I'm tired of not getting any service going from one branch to the next. The amount was agreed upon"