Kohinoor Televideo — Was given commitment of new piece next day but was given demo piece without informing

Address:

Andheri west

I had paid for a new whirlpool refrigerator from Kohinoor Andheri West, and they had given commitment that a new piece will be delivered next day. But next even by 7 pm I didn't receive delivery. So I went to the store and there o realized that they were sending the same demo piece from their store that too without informing us about the same.
We have lost trust in Kohinoor and do not want to purchase anything from them. We want them to refund our money but they are giving credit note. We don't want credit note. We want refund.