Perhaps in the future wait 24 hours before finalizing a purchase since you seem to cancel quite quickly.
The holiday season is always more hectic than other times of the year.
Also, there have been cases in the past of customers ordering and then cancelling after the item has shipped, then keeping the product, which is fraud.
I always find the QVC Social Team extremely helpful, but it appears you may be a new customer and may not yet have an established credit or shopping history.