Big Upgrade Mistake

My issue is that we upgraded a contact, moved it to my wife, signed for a a certain amount and received a bill that is more than double of what we agreed upon. When the contract was moved a new number appeared on it, which we did not ask for. The "free" phone that came with the upgrade, had a connection fee of sorts, handset installment and sim insurance. The contract that was supposed to be closed now also has a number which I am getting charged for. I have been to the Clearwater Mall store where everything was done, but nothing came of the issue I reported. Why do we as consumers always have to pull teeth to get issues resolved?