Having worked with a lot of funders who have a lot of different rules on exclusivity, the only thing that matters is consistency with the rules. As long as a bank sets the rules and then sticks to them you can't complain. Nothing you can do here you don't have a leg to stand on. Situation sucks you lost this deal but one day you will be on the other side and you will be the one who benefits from the rules. Until then keep your head down and keep dialing