cancellation of data contract

Vodacom I cancelled my data contract with Phiwo on 29 November 2017 she advised me that my last debit order will be end December as per call ref. 1- ********** ********** . December a debit order went trough for R312.00 all good with that but today 01/02/2018 another debit went trough for R301.35 I phoned Vodacom 3 times on ********** ********** ********** and they diverted me twice still up to now I don’t have an answer way my account has been debited my explanation will be useless service nobody knows what they are doing or what is going on . . . . Please advise Contract no ********** **********