GroBroPros

I believe there is some sort of problem with the challenge that may have been caused by the servers going down. I just completed all 5 of the missions on legendary by myself and then the serves said they went down, when they came back up it said I had only completed chapter 1 and 5... so I completed them ALL again on legendary by myself and still did not get the challenge. I was wondering if we should contact 343i about this but I don't know how. Very frustrating. It's the only challenge I didn't complete today.