Stop debiting my account and cancel my contract!!!!!!

Vodacom, I cancelled my contract which was expiring in December but its still being debited from my bank account . I have phoned countless times but noone seems to care to assist me. My last phone was on 5th March 2021 at 22h07 and i spoke to Buli. I would actually like to bd refunded the money for all ths months that you have been debiting my account without my consent. Im very disappointed with your service. Id there anyone who cares to assist with my query.