Bad Service Ever they can't explain what happened to my data why did it depleted within 2 hours 4GB for Facebook and what's app only

Bad customer service ever I called today and my call was answered by a gentleman I did not take a name and he was unable to resolve my query or to explain what happened to my data why did depleted with 2 hours data I have never experienced this before I have been using Telkom data since last year to cut the story short the gentleman I spoke with he disconnected my call then I called again I spoke with Delisiwe she did the same thing then I called again I spoke with Nontobeke requested to speak with TL she advised that she is currently on the call they call me as soon she is done I waited for 1 hour still no call so my request is how possible I used 20G from the 23rd August to the 1st September without updating any software being on you tube or watching a movie so 20G just for FB, insta and whatsap and I always buy 20G for four days and I have never finished I went to my data usage and the summary for the month its not even close to 20G when I calculate myself it's less than 20G so my request I want my R199 back that I bought the data that you ripped me off non negotiable all you have been telling is that you can't calculate what data I have used on each app bull**** why the hell do I have that summary if you don't I have been using Telkom since last year and I have becver experience such thing not even close I have been browsing play you tube on my smart TV and nedfllix for hours but my data not depleted why please someone sort this out because it's frustrating how will I buy another data if this is not sorted if I have to change service provider let it be so.