Well maybe for legal reasons they cannot disclose all the information passed on to them by the merchant or the merchant for legal reasons cannot disclose all the information? I won't pretend to be a legal expert.

I know that you've had trouble with bigcrumbs before, but it seems as if those problems have been worked out. I'm not sure why you would forward on your history of another cash back website you've used. The only thing you might be able to do is to ask bigcrumbs to re-confirm their information with that merchant.

My only possible explanation if you were not trying to double dip using extra rebates is that you may have accidentally initiated the transaction using another rebate site and then tried to use bigcrumbs or vice versa. The only time that I know of that you can use bigcrumbs along with another cash back website was with bing and you had to do things in a specific order in order to gain cash back from both sites.