Should i refreeze my ball pythons rats if he doesn't eat it?

No, absolutely not. Just throw them away and try feeding again in a week or two.

Keeping a diary of your snakes feeding schedule would be an ideal way of telling roughly when he is ready to eat again. This cuts down the amount of wasted 'food'. If you thaw, re-freeze and re-thaw food items you run the risk of bacteria buildup in addition to the food item partly decomposing.