False advertising and unhelpful employees

I had seen an advert on Facebook where multichoice was advertising data packages where they had stated that 50gb day then 50gb night for R199 and for the first 3 months you will get 100gb day and 100gb night. I opted for a callback and spoke to 1 of the consultants that 50gb will not be enough I opted for the 100gb throughout he assured me that 100gb will be my package. To my surprise after I had activated the router only 25gb was loaded after many failed attempts to resolve this through their chatbot, on the 3rd of December I emailed their customer care and was assigned with case no ***. It's been a full month of up and down with no assistance the only thing they managed to do was log and collect their device but still debit from my account on the 1st and now when I contact them they want documentation and act like they have no knowledge of the collection when I took the initiative to notify them when it was collected on the 11th of December. This is frustrating as their employees are more than happy to **** us rather than to assist us.