Absolutely bad service!

I was due for a upgrade, I phoned to cancel and go to prepaid. Lady convinced me to keep contract for a set amount - confirmed amount more than one time. End of the month came, the amount debited from my bank account was nearly double.

I phoned (***), said someone will phone me back and explain and amount will be rectified - nothing happened. End of month came, same higher amount was debited from my account. Phone them again - still empty promises.

Up to today I have phoned 4x - still waiting for a return call after my last call on 21 December. This is really pathetic service!!!