CANCELLATION REQUEST SIMPLY BEING IGNORED

My 24 months data contract expired on 30 September 2020. In August 2020 I sent two e-mails to the cancellations department giving 30 days notice. Since I didn't receive any feedback I logged a call on the VODACOM call center number *** and received a reference *** confirming the cancellation. To my dismay I am still being charged. 6 calls and 3 months later the contract has still not been cancelled. Vodacom is now deducting money from my account WITHOUT my consent and is simply making empty promises. Just yesterday I was promised the contract will be cancelled before close of business. I called this morning and still the same status. I used to pay R149 for the contract they are billing me R350 for end of December. I've been a customer with Vodacom for 10 plus years and never experienced this pathetic service.