Vodacom please stop deducting from my account

I finished paying my contract phone in December 2021, before that date l called the cancellation department and my cancellation process went through. Since the Vodacom has been deducting R6.99 every month. I then called even three times and spoke to three different consultants who promised me that the R6.99 deduction would stop.... but guess what it did not work. Vodacom please stop deducting this amount from my account. I paid off my phone and l have no intention of paying more money . Could you please assist with this issue because l am tireeeeeeed of calling every month and still getting my money deducted every month