Or ones that outright are dishonest. Had a slew of fraudulent returns on ebay and called only for humans to waste my time and end up saying "I will submit this to some-other-department and I very much expect the case to be ruled in your favor" only for them to send me an email an hour later saying the ruled against me. This happened like 3 times in the span of three months. I eventually learned I can't get all of my money back if a buyer trashes my item on purpose, returns it to me in a literal pile of ewaste pieces, and thoroughly document everything and bring it to ebay. I've been selling for 15 years, too.
It seems like customer service nowadays is just to wait the customer out. Mercari made me send 8 unique photos in order to get a return...wtf? Just waste their time and make them jump through as many hoops as possible I guess so that they give up. I feel like in a decade online retail returns will be the equivalent to cancelling gym memberships.