i agree with the sticker suggestion. a gio is just a beginner's guitar. not worthed to spray the whole body. would probably cost around 300-500 or even more to airbrush the whole body.

spraying the dented part may work since yours is just black. just use spray can for cheaper option and some epoxy filler.

as with the others, the concern is the playability of the guitar. the electronics has little chance of dmg as they are inside the body. it's the neck. falling from a chair's height could seriously dmg the neck, even though you can't really see visible marks. there must be some after effect from the fall. check and double check. most likely you need to re-setup the guitar.