One of my issues with the situation is with the use of the word "bonus." If it is a contractual obligation (as has been represented) then it is not a bonus. The phrase "guaranteed bonus" is an oxymoron. It is not a bonus if it is guaranteed. A bonus is something extra - usually based on results or some unknown (at the time the potential bonus is established)outcome.

This imprecise use of the word "bonus" only further confuses the situation.