I'm in a similar boat. A UK bank thinks I'm one of their customers (someone with a similar name). The reply address is no-reply@ and I'm not about to call a foreign bank.

I had the same happen with a AU insurance company that also made it hard to reach them.

I sent an email to their regulator that this company keeps sending me confidential information about one of their clients. It took one day until I received an email from the company informing me that they've corrected the mistake and I shall no longer receive any emails, and it worked, I haven't received a single one since.

Maybe I’m lazy but why do above four posters do so much effort?

I just mark as spam and or block the sender

If I made a mistake while entering data, I'd be happy if someone told me they receive emails from me that they probably shouldn't be getting, so I do the same when it's not obvious spam/scam.

same. although, if it's a reservation you're being sent, you can cancel it to let the person know they're using the wrong email (plausible deniability because you don't recognize it, yet are getting a reservation)

How would the person know their reservation is cancelled?

they'd show up for the reservation they made and find that it doesn't exist!

Quick note that if you use a proper email hosting service, or host yourself, you can add a sender block rule to eliminate this nuisance.

Are there email services which don't allow you to block addresses or keywords?

From: no-reply@ and simlar fake senders should just result in immediate rejection of the mail at submission time.

Tempted to set that up on my server.

Getting a U.K. bank account without having a U.K. mailing address isn't the easiest thing in the world to do. Maybe someone would be interested in acquiring it from you.

Is this Hertz? Somehow Hertz in Mexico decided to add my email address to their mailing list, and I tried to complain to every level of Hertz to get them to stop. Their hosters didn't care, their upstream didn't care.

I decided to download larger files from their web site a few tens of millions of times, which I think cost them a few hundred dollars. Unethical? Perhaps, but I'm not the kind of person who just accepts that companies are too large to have humans that can communicate and that I should just accept their harassment.

It worked, though. I finally got a response from Hertz saying they were going to "get to the bottom of it", and I finally stopped getting their spam.

When you say "it worked" referring to you downloading big files to generate cost for Hertz, it mean you told them you were doing this and would stop if they remove you from the mailing list?

I received spam for quite a while from Robinhood, back when they suggested they were going to enter the UK market and to sign up for more details.

They didn't but I still recieved spam which I couldn't opt out of because they wanted me to log into my account, even for support, which obviously didn't exist.

At least back then we had Twitter and messaging them publicly got a customer service response.

I know that feeling all too well. There's an Australian guy with a very similar email address that keeps entering it incorrectly, and I end up with the promo emails for these accounts. And because some of them are geolocked to Australian IPs, it's impossible to unsubscribe via the links in the footer.

I get emails all the time for some person in the US who must misspell his own email address. So far I’ve cancelled his haircut and car garage booking.