First make sure you read this http://ball-pythons.net/forums/showt...ius)-Caresheet.

Second, what the pet store told you about feeding is incorrect. With very few exceptions you should always try to feed in the enclosure.

Try not to overly stress about it not eating. If your husbandry and your feeding methods are correct eventually it will eat.

Try to post a picture showing the whole animal.

A pinky anything is most likely too small for your animal. Should be about the same size around as the biggest part of the snake.

Last, if you live on the east coast in south florida, please PM the name of the reptile store you got the animal from. If it is one of the ones I deal with I will go correct the advice they gave you.