Worst Customer Service Ever

I have an ongoing saga with Vodacom regarding a Data Contract which was due to expire on 9th July 2018. This contract was costing me R300 per month with the discount, but on June 1st I was debited the full amount of R500 as I was informed that I had taken an early upgrade and therefore the discount no longer app****. I immediately contacted Vodacom and told them that I no longer wanted the contract and to terminate it ASAP. After at least 8 telephone calls to Vodacom accounts department and 4 trips to the V & A Waterfront Vodacom shop, I finally managed to get them to agree to an early termination for which I paid R377.53 on 22nd June, and was informed that the contract was terminated and no further payments were required. I also had to forfeit all the remaining data on that contract. On July 1st I have again been debited with R500 for this data account and according to their website, I will be debited again on 1st August. I again phoned the accounts department and explained the situation for the umpteenth time and was assured that I would phoned back within 1 hour. Needless to say this never happened. It is obvious that Vodacom have no interest in resolving customer complaints and by ignoring them they hope people will just give up.