O2 complaint procedure appears to be non existent. Furthermore, no contact email address , like cust

[AngieB]

Something seriously wrong at O2: no customer support email address! Apparently no customer complaints procedure! No way to contact , especially when travelling! One (1) hour in queue trying to speak to a human being. O2 continue to debit my account with unrecognisable charges. Customer service : nil; customer support in time of need: nil. Martin Lewis (consumer guru) HELP !!! Wait til I get home O2☹️😬😠 is this a sign of things to come 😩

[MI5]

I doubt O2 will be too worried about your return home.

There is no email for customer service and hasn't been for at least 10 years or more.

All contact methods here Guide: How to find help & contact O2 

Roaming guide here Guide: Roaming MegaGuide 

Complaints guide here https://www.o2.co.uk/how-to-complain