Missing Data Bundle

I had purchased a data bundle on the Everydag Gigs platform on the 22/10 at 20h47 for 500MB to continue watching You Tube, By 21h00 I received a SMS stating that 50% of my data had been used, by 21h03 I received a SMS stating that 80% had been used, by 21h05 data bundle was depleted. This was impossible and queried with MTN via 135 on the 23/10. Needless to say this was a pointless exercise, at 09h21 a 'Lerabo' took my call, not interested in assisting me and promptly cut my call. Called back at 09h25 got through to a gentleman, didn't catch his name, took my details and assured me I would get a call back. To date nothing received. This can all be verified on the recorded calls. There is clearly an error in the data usage and should be rectified and NO there are not background Apps running to use the data. Then the MTN staff manning your Call Centre should make good on the undertakings they give... I specifically asked will I get a call back and was assured this will happen.