Sorry you feel overlooked. We are a small team and try to answer as many posts as we can but some posts still slip through the cracks. I see from your post history that we did respond to one of your posts, 2 others were answered by another player and only 1 (about wheat) was not answered.
There are several possible solutions for crash issues that might also help with your coop and other issues posted here
Logs are files that record some information about your game session, including errors. Information on finding and attaching logs can be found here
As for a refund, you would need to contact the retailer you purchased the game from. If you purchased directly from our website, you can email firstname.lastname@example.org