Bumper problems of the 2001 Dodge Caravan

I purchased a bumper for 2001 Dodge grand Caravan sport model from ohare auto recycling & repair (280 old higgins rd. Unit 11 des plaines,IL 60018- phone 847 299 1444). The employee joe gave a wrong year bumper, and made us wait for over 3 weeks. I am in a rent a car business and explained to joe that I cannot let my van sit on the lot for a long time. Joe promises to deliver the bumper every day since last 3 weeks and does not even refund the $250. 00. Just today when I sent my guy with a receipt to get the refund the owner of the store threatened to throw out my employee out of his store and threatened me over the phone that if I send my employee every again he will kick my employees ass and throw him out of the store. I believe joe the employee is on medical leave and the owner is saying that he will not refund any money to anybody and that I should forget about my money. We have already returned the wrong bumper back. Please help in disciplining the owner and his employee and help me in getting my $250. 00 back.