Tell the dealer you are returning the guitar and crappy case for a full refund plus shipping unless he can make it right. Everything is negotiable. A "reputable dealer" will make an attempt to make the customer happy. If you're willing to give a little, and figure out your walk away amount, maybe you can get a decent case at his cost so he won't lose his commission and reputation in the tiny and close knit CG community, and make the deal a win win.
All this time I thought I was making music; it was making me.
2015 Steve Ganz "Solidarity"
1980 Dauphin D30
1962 Fender pre-CBS P-Bass
National Triolian Uke ca.1930
Almost as many fly rods as guitars