Vodacom cellphone contract

My cellphone contract was ending February 2020 and i notified vodacom lastyear December that they should cancel it when is due but to this day it seems vodacom is reluctant to close the account.Today vodacom emailed me invoices.Lastmonth on the 13th i spoke to a consultant at vodacom who then retrieved all my voice call records with previous consultants and promised me that the contract has been closed and no debit order will go through,but it went through and i reversed it.My solution is to lodge a complain with ICASA because this will mess up my credit profile.