Vodacom ***** me over after I paid R2000 for premature cancellation

I took out a contract with vodacom and made a premature cancellation which cost me roughly R2000. After that they said I must make another payment of R400 (which I made). Approximately 4 months later they send me an email that my account is in arrears and Im handed over to their lawyers!!! *** VODACOM??? Even the girl at the shop said its not suppose to be like this, because I made the premature cancellation (the consultants just catch on **** with this pathetic telephone calls)!!!!!