I have three credit cards, one that I carry with me. For my business I have two credit cards since I do property management, one for that one and one for the corporation charges. I don’t want or need other credit cards. Throw it away.
It’s possible he is in the process of becoming a victim of identity theft. Throwing it away and ignoring it is the last thing he wants to do.
He needs to contact the bank and find out what the heck is going on.
He should also pull a copy of his credit report to see if there is any other unexpected activity.