Hang on a second. If they can find you alternative rooms (at higher cost) then surely force majeure doesn't hold:

http://en.wikipedia.org/wiki/Force_majeure
Force majeure (French for "greater force") is a common clause in contracts which essentially frees one or both parties from liabilities when an extraordinary event beyond the control of the parties, such as flood, war, riot, act of God, prevents one or both parties from fulfilling their obligations under the contract.

If they can find you alternative accomodation then they can house whomever is in line to take your rooms in that other hotel.

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