wrong contract

Recieved a call from a consultant to migrate my acc, i asked will i be paying more for what i am recieving already? She said no, i will be paying less. (check phone call recording). Month later i am paying more so i started calling and log a complain. 3 weeks later still no responds. Call a couple of times again, even spoke to a manager and he said it will be sorted so i explain they said they will get back to me with in 2 working days. No respond..... Call again now i have to pay a \fine"to go back to my smart S contact cause they switched my contract to asmart M. With out my consent. Now its debit date and no response and where told this morning"