I think the only problem I've ever had, was I ordered a Made in Abyss wallscroll and it was very clearly the wrong size from the one the seller posted. I gave him negative feedback and he offered to refund me if I changed it. I did, and I thought I changed it, but I guess I didn't submit it right. I got lotsa angry messages until I looked at it again.
So long story short, seller was a dummy, I basically accepted a bribe, and I got a free MiA wallscroll on my door for my trouble.