Same with me-- someone used my email to register for Airtel India, and I started getting his bills. Airtel have a complaint/abuse email and I told them about the mistake-- there was a lot of "hoo-hah" but nothing happened.

The bills are in encrypted pdf-- but the encryption is trivial to remove. I looked at the bills, its someone with a name similar to mine, just one letter different. I emailed the real person, telling him he had used my email, but got no reply.

I just press spam now, and the emails have stopped coming to my inbox. But I still get the emails 6-7 years later. Its mind boggling as how a) Airtel never confirmed the email b) Havent stopped sending even though they've been going to spam for years now