Join the club, Pauline. I've not been buying from QVC either since this happened to me. I was just going to post a link to the thread I started on the same subject but I see the threads have been merged (thanks, Admin).
I'm still suspicious about this new system they have. Since I last posted, all I've had from the CEO's office is an email following my letter, saying someone would be in touch. Someone from Customer Service then rang me a week later. He said the decision on the new system was taken high up in the company - they decided to go with it despite it not being any good for Amex cardholders so it does look likely they did it for cost reasons.
Boyd could not even be bothered to reply via his PA or something, and just got one of the flunkies (who was nice enough, to be fair) to call me, which I think is very poor. Still, it has strengthened my resolve to cut right down on QVC purchases or possibly stop altogether. I have not spent anything at QVC since all this. I have already cancelled two Auto Delivery programmes too - as there were a few deliveries still due on those right up to March 2017, that's about £200 worth of custom they've lost from me on ADs alone. I have even stopped buying Yankees from them which is unheard of for me! The whole episode has made me think a lot more carefully about what I buy, which is a good thing!
The CS guy said the CEO had taken my letter seriously and would speak to the Finance dept. I don't suppose he could care less but hey, it's their loss if I don't shop with them again so *raspberry*.