overcharge on cell phone and tablet respectively.

Since recieving new ph., the Experia for its renewed contract period in Feb. 2015, &taking out a contract on a 7 inch tablet with 2gig package, the bills have been exorbitant. After many visits to the branch in Kenilworth Centre,and liason with Candice at the branch, I was advised to go to you. Many emails &complaints&phone calls for the last 4 mnths - to no avail. I\m afraid to use the data on my Experia