Sales Agent **** t me

i am highly disappointed with Vodacom. getting a call and the consultant lies to me about the deal they are giving me. i asked specifically that if i take the new deal i wont pay for 2 lines and he agreed. now i am trying to cancel my current line and i am told that my contract has to end first. why do sales agents lie????????? who is suppose to have 2 lines with Vodacom and for what reason???????????