Priceline's customer service number is 1-800-774-2354. I booked a 1-week mini van rental with them but needed to cancel because my sister had severe flu. She was worried about it turning into bronchitis. I e-mailed them asking if they could charge me a penalty instead. I stated that we would not use the rental. I would be at a $500 loss, the rental company could rent out the mini van (at a shortage during the holidays), and priceline could still get some compensastion. They e-mailed me back asking for the name and phone number of my sister's doctor and the nature of her illness. They then e-mailed me back with the 1-800 number asking me to contact them. They ended up charging me a one-day rental cancellation fee ($62) and refunded the rest. I hope this help some of you out there. I used the name your price option which supposedly is non-refundable.