Customer Service Fail: They Just Called Me A Liar

My parents bought me a KVM for the holidays from StarTech.com. It stopped functioning after a month. I’ve been trying to get it replaced, and this is the obnoxious accusatory email they just sent me:

Hi Dave, 

Thanks for your reply.This product being a gift is contradictory to your RMA comments: 

"The unit stopped working a month after I bought it. The light blinks non-stop and doesn’t send signal to my display" 

You had stated it failed a month after you had bought it. Now you are statin it was a gift. 

Unfortunately we are unable to perform any warranty fulfillment for any customer without an invoice for the product. We need to prove the product purchase was a legitimate purchase as we only provide Hardware replacement to the original owner. We also need to prove that it is within the warranty period, as we have been selling them for quite some time. 

I’m going to get the receipt, and try again (though I was hoping not to have to tell my mother it broke). But the point is, don’t accuse your customers of lying. Also don’t have idiotic spelling errors in your communication with them. Who cares if I said I bought it? They aren’t a crime team, they are a customer support team.