Security Services within System Services draining my data plan

Yesterday I received a message from the carrier saying that I used all my 16GB plan. This is the first time that I run in this situation. Bought 4GB more and in 3 hours they were out. After I bought 4GB I reset stats an then checked again. Security Services within System Services draining my data plan but I don't know how to turn it off or how to fix this situation. Attaching the screen shot. Turned off cellular data as I'm about to run out of data for the third time.

Any hints or solutions?

This is killing me . Thank you for your help!