My wife had someone do sign up for a bank account with my wife's gmail address. She told the bank they got it wrong, and they went away for a bit and then they re-signed up AGAIN. So she told the bank to close the account. It didn't re-occur after that.
A number of elderly folks have had this issue as well. I'm really at a loss on how to fix it, some times there are bad actors but generally it seems folks are clueless and the signup flow doesn't adequately account for this.
I had that happen, but I couldn’t fix it because I couldn’t prove I was a customer, since I wasn’t.
I have a common-ish first initial, last name Gmail account. The number of people who think they have my address is staggering. Hundreds over the years.
In one case, the manager of a large factory was forwarding me an email with remote access credentials and VPN software every month.