CSA Audio, Montclair, NJ, 35 years ago. Paid in full for an Audio Research RPR-1 with faceplate that they were to order for me. Weeks passed and when I called them, they gave me hassle and excuses. I went to the store, and when they finally admiited they hadn't ordered it yet and couldn't give me a delivery date, I asked for a refund. Mind you, I was as polite as could be. They asked me to leave and when I repeated my request for a refund, they called the cops!
I then called ARC and had the unit - it was the last they had - shipped to another ARC dealer. (Audio Advocate in Millburn.)
CSA did finally refund my money. I never did business with them again.