ONLINE POKER - SITE - Party Poker

I was playing 7 card hi/lo today and had 8,7,5,4,A for lo, and didn't get the Lo pot (1/2 the pot), but the hand that got it had 8,7,5,3,2. I have screen shots to prove it. I e-mailed PP and have yet to hear back from them. I have often thought they were rigged, and this just proves it to me. If their computers can make this simple of a mistake, what other mistakes are they making? I asked the table what had happened and only one guy responded and said that I should have had the Lo hand.