Is this an expensive rod? If not it could be cheaper to buy another.
A guicky would be to use electrical tape to hold the reel onto the seat.
I would check with your local tackle shop and see if they can fix it.
Normally I would cut thru the reel seat and blank at an angle. This will permit me to put parts together with proper alignment.
Remove old reel seat. Now you need an 8" piece of scrap blank that will fit into the 2 pieces of your rod. This gets complicated. Feel free to call me if you want to continue this process. It is easier to explain on phone or at the Lindenhurst Fishermans Flea Market this Saturday.
Have Fun Fishing. Capt Neil
Custom Fishing Rods by Captain Neil