Cancelled contract with Vodacom

My contract with vodacom expired in October 2023, and started to run on Month-to-Month basis. February 2024, I called vodacom to cancel the month-to-month contract, only to realize that my bank account was debited at the end of the month. I then called again around 13 March to query this matter and was promised that the contract has been cancelled. was surprised when I received text message that my account will be debited with R430 and had never agreed with vodacom for contract of R430. can vodacom be so ********* and desperate to squeeze my pocket when I do not need their contract anymore, I find this to be extremely pathetic.