I went down to my local guitar store and bought a guitar off the rack for 500 dollars.

On the headstock it says RGR320EX but i looked it up on ibanez website and that's nothing like the guitar i have. The guitar i have looks likes a RGR420EX. It looks just like this one
the white one.

Is there a way that the stamp of what type it is is wrong or maybe is it that someone did a custom paint job to make it look like a RGR420EX?

Help me please.
there is a warning on the ibanez website that there are a lot of forgeries of ibanez guitars are going around, maybe it is possible that you have picked one up.