Nu Debt spamming my mailbox

Nu Debt collected information on someone. That person just happened to have given them my email address instead for a BOLTTECH account. I have been receiving tons of emails from Nu Debt regarding this. I've asked them many times to reach out to the person and verify the email address and kindly remove mine. They refuse stating that I have to prove that this is indeed my email. This is annoying because I have no relation to the person they are looking for, nor do I have any relation to the business they are collecting for. Can someone please help get Nu Debt to stop spamming my email ddress.