Vodacom Black Friday ****... I'm supposed to receive 80GB per month, but receive only 60GB

On 25 November 2017 I upgraded my data contract with a Black Friday special, at Vodashop Stellenbosch. The special was on till 27 November. Accordingly, I was supposed to receive 30GB anytime data and 50GB night owl data for R399 pm. I also received a wi-fi router. Yet, when I checked my Vodacom app on 1 December I was allocated only 60GB.. My husband went to Vodashop and was told that the app was reflecting an incorrect data balance and that I indeed received the 80GB. I phoned customer care and was told that definately only received 60GB. I was told to sort the matter with Vodashop. We went to Vodashop on 10 December spoke to one of the managers. He said he first had to request a copy of our contract from Vodacom, but that the matter will be sorted by the 14 December. We didn't hear from them and I phoned on 15 Dec. I was told that Vodacom were investigating the matter we will hear from them soon. On 19 or 20 December my husband went to Vodashop and requested details of Vodacom's area manager and that of the shop owner. He was told that it could n't be disclosed. He then told them that we feel Vodacom are dealing dishonestly with us and that we want the 20GB, otherwise we would go on social media. On the morning of 21 December I received 20 separate once off 1GB data bundles from Vodacom. Vodashop phoned me right afterwards to enquire whether I received the 20GB, which I confirmed. They informed me that if the issue wasn't resolved by 7 January 2018, I would be allocated another 20GB. On 1 January my Vodacom app again showed that I was allocated only 60GB. January 7 came, but I never received the promised 20GB?! I phoned Vodashop about 14 Jan was told that someone from Vodacom informed them about two weeks after our December 21st conversation to say the matter was resolved. I asked them to email all the details to me, yet never received the email! On 18 January I phoned customer care. The lady informed me that Vodashop placed the wrong deal number on my contract. She also said according to Vodacom sales dept that there was never such a Black Friday special for 30GB any time and 50GB night owl, it is always 30GB and 30GB??!! I told her that I my husband took photos of the billboard on which the 80GB special was advertised. She got very impatient and irritable when I insisted! It was clear to me that she wasn't really interested in resolving my issue and wanted me to go away... I asked to speak to a superior but it seems they didn't want to speak to me. She told me to resolve the issue with Vodashop. She reluctantly after a very long discussion of over 45 min, agreed that I could send her the photos and gave me an email address. In the end, I never sent the email as I felt that it would be a waste of time!! On 22 January my husband again spoke to manager at Vodashop, who promised to contact the area manager. He said that Vodacom was supposed to link 20GB each month to the normal 60GB data package, but that they never did that. On 25 January Vodashop requested that I write an email, which would be forwarded to the area manager, which I did. That afternoon a man named Faseeg, called me. He said he was from Vodacom and that the problem I was experiencing was a "general problem" and that more customers didn't receive the xtra 20GB. Apparently Vodacom have technical difficulties with this 80GB special. I didn't hear from him since and when I call his number there is no answer. I want to know how a big company like Vodacom, with all the resources available to them are not able to sort this "technical problem"??!! Vodashop told us there is nothing more they can do and that they have 3 reference numbers to show that they tried to resolve the issue. What?? What kind of service is that??? It's your responsibility to see the issue resolved!!! Furthermore, we were given so many different explanations....so many stories??? I have been a Vodashop and Vodacom customer for years!!! How can Vodacom treat their customers like this??? What are we supposed to do now???!!! This is so dishonest!!!!!!