Robery in contract cancellation

I had fibre and data router contracts with Vodacom. In May 2924 I called them to cancel my both contracts I was told it's early I must call them in June. Today I call them speak to a consultant and he refused to send me confirmation SMS on the number I requested him to do. I called in again spoke to another consultant, he advice that they will deduct last at the moment Nd of June as I pay in areas . After a while I open up my emails I find an email saying contract will be end in last day of June but deductions will still run till ekd of July . This is ******* as my contract ends now june and they want to continue doing what they did with my phone contract. They deducted for 8 months after the cancellation and they never refunded my money. I am tired of this service provider. Kindly assist