I bought the built in VM 450 oven and microwave,...

I bought the built in VM 450 oven and microwave, the problem is it is only designed to go in certain built in units, when I put it in the space where my old oven came from(also a microwave and oven), it got so hot it cracked my marble work top. Customer services refused to replace it, so i am left with a very dangerous appliance. will never use CDA again.