How many gift cards were you trying to load in a single transaction? I once tried four and I got an error after the third card. They cancelled the transaction and we started over but only with three cards this time. I was then able to use those exact same cards. It made me nervous when it happened.
Can you give a little bit more detail of the events that occurred?
As far as getting a receipt goes. I have been able to take the card I used into Walmart and get them to print me a receipt. (I do this lot's of places) They will want to know which register you were at, date, and time. You should have the date and time on your gift card log.