RIDICULOUSNESS!!!

Seriously not sure what to do anymore as this is the second similar complaint I have lodged vs Vodacom in months...and its down right ridiculous. Months ago, I cancelled my contract with Vodacom and carried on being debited. I complained on this very platform after calling the call center and got a refund and an assurance that my account was closed. Two months pass and I get debited again, I get in touch with Cassandra who helped me out previously and instead of a refund offers me Vodacom airtime. I refuse the airtime because I dont have a product with Vodacom - which is the basis of the whole complaint. I again get told my account has been shut. This morning I see I have been debited once again by Vodacom. How is this still happening? Makes no sense to me