Data service not cancelled for +2 years

When i upgraded my line 19 October 2016, i clearly stated that i wanted my 3 gig service cancelled, but this was never done, since then i have been paying R299.00 and regardless of how many times i requested to cancel this, Vodacom still took this amount and failed to credit me.

I have held Vodacom's payment as the sum is now over R8000.00, i have been getting numerous calls to settle my account, but no one has done anything about the data credit.

When Vodacom can pay me back, i will gladly settle my account, and since my services have been blocked, i will also be moving my business contracts over to MTN, Telkom or Cell C whomever can give us the business support that Vodacom is clearly lacking.

FYI i have several emails, and correspondences in regards to this, about this service being cancelled and a credit being verified but nothing has come into fruition.