Vodacom's glitch stole my data and I am being told to by more when reporting after office Vodacom letter

I discovered on Tuesday whilst I have a wifi router with 10 gig day data my data on my router and phone was depleted announced by a vodacom message. This was weird. I did not use my data , yet suddenly depleated! I called and logged a query upon which the Vodacom consultant told me they had no issues. Yesterday I called again afterhearing on Jacaranda FM 12 000 Vidacom customer's data was depleted and this was due to a Vidacom glitch. Again I was put on hold and the Vodacom consultant told me they had no issues with dara and knew nothing. I had the official letter in my hand from Vodacom. Yet again repeatedly told they had no issues and I had to buy again. This means R1100 data on prepaid and router just gone! I did not use all of it and told them to pull monthly usage. I have been a loyal customer over 20 years and apart from being ripped of by being heavily overcharged for data I am being told they will not replace after *****ing my data. This is not on. I demand my data be replaced by Vodacom. See letter attached.