Vodacom refuses to cancel contracts, 1year after expiry of contract still not cancelled

Vodacom refuses to cancel contacts. I have visited your vodashop here in Knysna 5 Times and instructed them to cancel this data contract that is at no use to me I DO NOT WANT it, I also do not want to upgrade it. I have called, emailed till date almost 1 year later you still bill me EVERY MONTH. THIS CONTRACT EXPIRED ON 6JULY2020, PLEASE CANCEL THIS WITH IMMEDIATE EFFECT AND CANCEL THAT NUMBER TOO. I DONT NEED IT I HAVE UNCAPPED WIFI AND MORE THAN ENOUGH DATA ON MY BUSINESS CONTRACT. THIS IS A PERSONAL CONTRACT THAT I WANT CANCELLED IMMEDIATELY. I am still receiving harassing upgrade calls to, i have asked more than 10 times to cancell this. Please sort this out now. The expired contract that im being billed still one year worth of R300+ every month ***.