Failure to deliver

I upgraded my account two Sundays ago. My contract was changed from Open Line to Top-up. After numerous calls failed and unresolved, I'm still unable to place calls. Promises of getting back to me never get fulfilled. I still have an unresolved query regarding my pricing and minute usage.<br> The call center as well as the stores seem unable or poorly trained in their jobs as they are unable to answer basic pricing queries.<br> I would urgently like the matter resolved and would appreciate feedback from someone who is competent in the above mentioned queries.