COMPLAINT: CONTRACT CANCELLATION

Hello. I bought a two year contract cellphone in 2018 from Vodacom and was supposed to pay monthly. I have paid fully this year in February as my contract was due but they are still debiting my money untill today. I went to Vodashop and told me to call *** for cancellation, I did that three times and the assistants tried to convince me to upgrade but I said "no I want to cancel my contract only" until they told me to wait for SMS notification which I didn't receive even today.Please help me because it is now 6th months Vodacom is taking my money and I am unemployed now.