Vodacom non action

I cancelled a contract with Vodacom on 2 July and was told July would be the last debit. Beginning August, no cancellation, and was told contract only ended end August. Fair enough. Requested that contract still be terminated at the end of August. This was not done and contract was still active 1st September. I again queried and was told the cancellation had not been processed but everything would be sorted out and a credit processed before the debit order for September went off. On further numerous calls, was advised that the contract cancellation was only processed on 15 or 18 September but a credit would still be passed to my account. Come end of September, no credit and my account was debited for the full amount. This particular contract was for over a thousand rand a month. It is now 20 October, and after getting no feedback, despite the fact the Vodacom team on Facebook Messenger have told me my query is in hand and feedback will be given, I phoned again to query my credit. Now I have been told that since the data was loaded on 1 September I got the benefit and will not be credited. This despite the fact I did not use this data in September, in fact unplugged the router completely and I do not see why I would be liable when it was Vodacom that did not do their job properly and act on my instructions timeously. I have always thought Vodacom was great but after my experience over the last two months with them I would not recommend them to anyone.