In my last email to them I did mention that I would letting people on all the forums I am on know what had happened! I was just shocked at their treatment of a FORMERLY good client. I, too had placed many orders to them over the years and was not worried at first when I discovered the problem. After emailing and speaking to them on the phone, their true colors came out and they were far from helpful!
In the first email they sent me in answer to my telling them the problem, they actually said
"If the mat is stuck in the low setting which is normally how it comes 99.9% of people leave it there and never go to medium or high because that is typically too hot. "
Can you believe it?! Its OK if its stuck because I won't need the other settings!