This has happened to me many months ago. When I return something, I do not use their return label. I pay the PO up front and track it.
Twice I've been charged weeks later for them saying I used their return label which I did not. I emailed the social team and they took care of it; however, it took a good 7 days to see both of the 6.95 credits on my card.
So far, HSN, I have not had a problem, knock on wood. I also find their CS people much easier to talk to and more helpful.
This year, I've only purchased 2 items from Q, which I knew I wouldn't have to return. They sure aren't what they used to be many years ago IMO.