Service cancelled and money is still taken from my account

This is one of several emails to Telkom, after visits to Centurion Tellom branch - several promises, no feedback, emails ignored??? Problem since 2016, and latest invoice wants me to pay by 5 January!

hi i cancelled LTE account ********** 30001 for mobile wifi LTE 25gb R299 pm - i cancelled at centurion case no ********** 8, on the mobile no ********** 647.

PLEASE CONFIRM CANCELLATION SUBMITTED ON 9 10 2016, AND REIMBURSE MONIES TAKEN FROM MY ACCOUNT!