One question is, does your husband have his residence permit already. I mean does he have the stamp in his passport? Many years ago I also had problems and was told that as long as I did not have the "official" stamp in my passport I could change. Unfortunately it was too late for me. So I recommend your husband gets his file number at the immigration from the mandoob at his company. Then with this he goes to the immigration and checks what has been done and if he can withdraw his application. If it is not too late he will be able to apply with another company as sponsor. If it is too late & he gets cancelled, he will have 2 year period of not being able to work in Qatar. Hope this info helps you. Good luck.
Aisha-Taweela