Got ripped on mobile phone contract

[menil]

A few months back I went in to renew my two year contract and get a new phone [basic handset only] .The young sales guy suggested I increase to $40 plan from $30 based on my usage and get a Nokia e51 handset in the deal .I have since noticed a big jump in my monthly bill and on closer examination found I am being charged $28 a month for a handset I thought was included in the contract $40 s .When I went back to querie the contract I was asked to leave the shop or they would call security .Great way to do buisines I dont think .I have never paid for a phone in the past .