Angryof Bracknell

I have recently travelled abroad twice outside of the EU I checked with Tesco prior to leaving and was advised that they could not offer a plan and had no advice On the plane I switched data roaming off and airplane mode on However upon arrival I received a text informing he I had used all my data and could not make calls or send texts I have had an online chat which got me nowhere The operative told me that in the first occasion I used my data in 2nd April even though I received the message on the 1st of April and my calls were blocked from that date I asked to escalate my complaint to someo