They dont get it right

I upgraded my phone,so they charged me for stuff which they said they wont.after numerous phone calls they could not sort it out.after I posted it on HelloPeter they phoned me and told me it will be sorted,but guess what.I phoned them again on 2016-03-30 to asked what is going.it looks like they did not subtract the money or at least not all of it.I phoned 4 yesterday and is still waiting for them to phone me back because their systems were down.I give up,they must do what they want to do.I iam fighting a losing battle.