Mirror Backing boards bent- No response from MR PRICE

We bought a super large mirror from them, 2 weeks later the guys come home to put up my mirrors and says the backing board is all bent and he had to drill holes in the frame to put the mirror up as it would not sit flat on the a wall due to the bent board. we send them an email and 5 months later no response at all. stop selling substandard products and then not responding to customers.