Mattress Firm

We bought an adjustable frame when we bought our mattress. The frame came with a free warranty. The sales associate wanted us to buy a different warranty for $249. I didn't see the point. She explained that this warranty would cover ABSOLUTELY ANYTHING that went wrong. So we bought it. Now my dog has chewed through the power cord. I call the warranty and they tell me no it is not covered. I feel completely ripped off!