Reading OP, it sounds like OP’s issue. I tend to read description first. If I need something for mobile VR, and description says nothing about it, I double check tris counts and whatnot (should be in the description) and if I don’t think it could work for my project, I contact author and ask if they have any plans releasing version for mobile VR. Usually it’s either simple no, or some sort of explanation about why it would (not) work on mobile or mobile VR. With all the facts given, I can make a call (right one or wrong one) and either walk away or purchase it. After that, if what I buy matches with what’s advertised, but it doesn’t work for my project (whether out of the box or after modifications), shame on me. There is no way I can justify asking for refund.
Being an artist myself, I wouldn’t not give any refunds to people who can’t make right decision given all the facts.