Vasanth & Co — Product delivery issue

I have booked a washing machine and fridge in velachery store 2 days back and they have assured the product will get delivered by[protected] but they called me and stated due to stock unavailability the product will get delivered on 20th but today they called me and stating that we are facing stock issues u have to wait for 4 days to get the product delivered thing if the stock is not available means why these guys are taking a booking and getting money after getting money why they need to treat customer in bad way I need a solution for this from vasanth and co