Re: the Evil Empire
Carphone Warehouse in my case (another tentacle of the Evil Empire).
Sent an email bill for a mobile phone I hadn't bought from a branch of theirs I had never visited.
Tried to tell them to redirect the bill to their real customer and...
All manner of rudeness, lying and idiocy from the "Help Desk" ensued.
I was told to visit a branch and take two forms of photo i.d. so they could set up an account "because GDPR". Once I had an account with them they would be able to talk to me about how I didn't have an account with them.
I amused myself for the next month by phoning them (hands free) every morning for a month and winding them up.