You have every right to be upset. My parents paid for my entire wedding 13 yrs ago. Even though my parents were more than willing to pay for it...i INSISTED that my in-laws pay for the rehearsal dinner...in FULL! (and they did) Did you daughter ever say anything to them? I know she probably doesnt want to get on their bad side since she did marry their son. I'm daddy's little girl and theres nothing he wouldnt do for me...BUT there is NO WAY i'm letting someone take advantage of his kindness.
Sorry that you had to go thru all this. Just remember though, no amount of money can ever make up for the great memory you and your daughter shared that day. Your daughter looked absolutely stunning!