Vodacom Retention ****, Terrible Service, Continue Billing in spite of cancellation

Vodacom retention **** - I called Vodacom to cancel 2 contracts with them which I never used due to their bad service and connectivity after the 2 year contract and was told I will receive a sms confirmation, but never did even after calling many times and holding on for hours, When I tried to report it to Vodacom ********** - their system did not work - it does not submit. Now they saying they renewed the contracts for another 2 years.