I’m on an unlimited plan but when abroad turned off mobile data and roaming as soon as I got on the plane in UK. I only used my phone via free wifi and yet I have texts telling me I’m going over my minutes.

Looking at my bill I can see no explanation as to why or how or where or when, and Live Chat was a total waste of time.

Why am I seeing this additional £13 charge? How is this possible with Roaming and Data turned off? Why can I not find a detailed explanation on my a/c or bill?