Builders Wareshous Refund ****

I bought a replacement generator from Builders Centurion and took it back the same afternoon. They could not refund me and gave me a Builders Card with the refund on the 26th. I have been from pillar to post but they haven't refunded me. Sent all my refund docs to Live Myokwana at MASSMART on the 30th, Two weeks nothing then they demanded a statement of account on the 14th. No feedbakc and no refund yet. Multiple emails and calls nothing.