Truck just bought yesterday from used Dealer turns out has a rear axle bent on it how can I get them to fix it
You should take them to the mechanic to have them aligned and corrected. Attempting anything on your own might do more damage. Depending on the vehicle and the extent of the bent axle, you can easily find a replacement or correction.
Normally a dealer offers 30 days warranty on used
take it back. it should still be in warrantee. if they refuse you can take them to court.
check out your state's "lemon law".
You should have at least a 30 day warranty. Take it back to the dealer for repairs and if they don't, take them to court.
RETURN the TRUCK!