In defense of Big Crumbs here is what I went through:

Placed 4 separate $500 GC orders in rapid succession on 3/5/11. This is when giftcards.com was first changing all their payout ratios to be a flat amount rather than a % and there were all sorts of issues with the various shopping portals.

The credits did not post within 24 hours (as they usually did) so I was worried about there being some sort of issue. I waited a week and then emailed BC letting them know they had a linking issue. They responded saying they didn't think so and to just be patient.

BC changed the payout ratio to be flat rather than a % at some point during this waiting period.

I emailed cust service asking if they would be honoring the % rate advertised at the time of my purchase despite the fact that my credits still hadn't even posted. They said yes.

I eventually filed missing credit inquiries after the proper amount of time ahd elapsed. I was eventually credited $2 per order.

Filed yet another missing credit inquiry, this time disputing the amount credited. I was eventually manually credited $10 per order bringing my cashback to the proper amount of $12 per order (I have a feeling giftcards.com did not pay BC this amount, I think BC did the right thing and decided to eat the cost here...no way for me to know this of course but that's my gut feeling)

So at the end of the day it took nearly 2 months to get everything I was entitled to but at the end of the day BC did the right thing