Excessive Data usage

I am now a few months into the renewed contract of 40gig data a month which was a special of 20gig + an extra 20 gig. ***)

The problem I have is the last 2 months I have run out of data before month end and have had to top up both months. Prior to this I always had a few gigs left at month end. My usage “patterns” are the same so there should be no reason for me running out of data.

Your app shows 1. Secure encrypted login 11.8gig and 2.Facebook 10 gig and internet 3.web browsing 5.8 gig which are the main ones.

I have been to three of your shops and no one can explain to me what the first item relates to. Neither can they give me an example of the type of things that I am doing that is using all the data.