MRc2 appeal stage - multiple buidlings

Hello folks, Not sure where to post this question but here's our issue: we received the final decision about our multiple buildings Project. We are going to appeal MRc2 which we pursued via master site. However they already made a decision on one of the 4 buildings associated with this master site. And they already denied the MRc2 credit before our appeal process is finished! How does this work? We never made an appeal before, especially for multiple buildings. Does the client have to pay a separate appeal fee for each building + master site even though is the same credit?? Is there a deadline that we have to enter appeal stage after master sites final decision? How many days? Thanks