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I had a similar situation at last year's WSOP, but was in your opponent's shoes. It was a significant pot and while I knew I was behind I thought I had the proper odds based on the dealer count. However, when it turned out he had significantly more chips (I think she said 10k and it was really 18k or something like that).

I called the floor over and he decided since I verbalized "call" and pushed out 10k, those chips would have to stay in the pot. He gave me the option of saving the extra 10k by folding, but I chose to call since it was now only another 10k or so. It sucked because I would have never called 20k...

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This is a horrible ruling that I am seeing more and more in places where they don't understand poker. Generally if there is a gross misunderstanding as to the size of the bet you are facing you can reconsider your action when you become aware of the actual bet size. The case in the OP is more complicated because of the action behind. In the OP I would be inclined to make the call stand because of the action behind.