Vodacom- Data disappearing from my contract - bad service whilst trying to resolve it

I have a few Vodacom accounts. I have an added benefit on my own cell number which is 20gigs of data added to my contract by a 75% discount costing R175 per month. This added benefit has accumulated and ot was more that 40 Gigs, but last night just after 20h00 my data disappeared from my phone. I was travellong and needed my google maps, but due to the missing data I could not use my phone as a gps. Immediately on the way I contacted Vodacom customer care. The person who assisted me told me that I did not have the added benefit. The more I told him what had happened the more he told me that I never had that added benefit. When I asked his name and confronted him about the bad service he actually decided to escalate my problem. I phone again today and I was informed that my benefit had been deleted on the system, but he can see that there was a data 20gig data added on as part of my package. Then O had to contact retentions in order add the deleted benefit again. After it was added I only received the new 20 gigs and the rolled over gigs that I had is still gone. There is however a double charges for 2x 20 gig bundle and I do not know why the data bundle is charged twice. 3 Questions Who deleted my existing added on 20 gigs for R175. Where is all my remaining data from the rolled over data. Why am I paying twice this months? Vodacom sent an email to say that my query is resolved, but I had no chance to say that it actually is not fully resolved.