Someone used my email to sign up for Instagram ~10 years ago or so. I never got a mail or any kind of verification, so I didn't know. Only found out when I trie

Someone used my email to sign up for Instagram ~10 years ago or so. I never got a mail or any kind of verification, so I didn't know. Only found out when I tried to sign up myself a few years ago, and "the address is already in use". So I took forgot password, and got the email. I tried to get support to move the other account so I could create my own, but they never responded. Luckily the account linked to my mail had like 3 pictures and 5 followers, so not to big a loss when I deleted it and created my own. I also got signed up for some kind of dating service I cannot remember the name of (before Tinder etc), and after being getting some weird messages in my inbox I felt I had to delete his profile. Sorry about the matches you lost. Given the nickname he's been using on some sites when signing up, I managed to track down his real email some time ago. Basically mine + a number. Asked him to stop using my mail, and what services he wanted we should try to move to him before me closing them. All I got in reply was something along "why are you in my inbox".