under counter oven and hob

I bought a Whirlpool oven and hob which was on special on Saturday. I spent Sunday modifying the cupboard to fit the oven, on installing the hob it was the wrong hob. When contacting Makro I was told that the correct hob is no longer made so just bring the oven and hob back for a credit. On investigating other makes, they are not the same size so the cupboard would need more altering. I then contacted the department manager who agreed tosouce a hob. I have been made promises for tomorrow every day, now I am told he can't give me a date, but one has been allocated to his shop at Carnavill. This really not acceptable as we no so we can't cook.