Charged double for data included (free) in contract package!!!

I’ve upgraded one of my contracts in September 2017 and the new plan (Smart Top Up S + ) was activated on 1 October 2017. The new packaged included a once-off 10Gb data, which was also supposed to be allocated to the number in question on 1 October 2017. However, the additional 10Gb of data was not allocated. I phoned Vodacom customer care on 1 October 2017 for the first time and was transferred to the upgrades department. I assumed that they were closed on a Sunday, as the phone just rang until it cut out. I then phoned customer care again and was informed that the matter was escalated and that someone will phone me back – no one did. I then phoned Vodacom again, on Tuesday, 3 October and was again told that someone from the upgrades will phone me back – but again, no one did. On 11 October 2017 I checked my invoice and noticed that the 10Gb once- off free data was allocated to my invoice and reversed again, but still, the actual data was not received. I then phoned Vodacom customer care again and was told that she could see that the 10Gb data was not activated and she then proceeded to activate it. I then got the shock of my life when I checked my proforma invoice as it suddenly went up by R 599.00. Vodacom charged me for the data!!! Not only that – they only allocated a Pro-rata amount of data, (just over 6Gb) but they still had the nerve to charge me the full price of 10Gb data!! I then phoned Vodacom Customer care again and spoke to a very helpful lady (for the first time since this mess started!!) and was told that she could clearly see that there has been an error on their side and that she has sent the request to Billing / Accounts, who will rectify the matter immediately. I received the following reference number: 1- ********** ********** . It has now been more than a week and I have been checking my invoice since, and nothing has been done nor has anyone from Vodacom contacted me in this regard. I find this unacceptable and expect this to be rectified by the time that this Pro-forma invoice becomes due. I refuse to pay for Vodacom’s mistakes and I am tired of spending my time begging Vodacom’s staff to do their jobs! Whatever happened to decent customer service? I understand that the error is human, but expect it to be fixed timeously. This is ridiculous!!