MTN data contract a big ****...

I posted a review with complaint reference 1- ********** 6247 on the 15th of this month and days later got a call from MTN staff Jessica on the 17th. Now she said I used up 31 gigs of data in one day??? How does that happen when I'm only using a phone not a business??? She promised to verify usage and revert I am still waiting. Truth is this is a **** by MTN. Still awaiting a response or explanation how anyone would use a whooping 31g on a phone when my allocation is 20gig day. I am very disappointed with MTN