Campaign legendary missions not counting

Completed the campaign 3 times now, once of normal, twice on legendary. BELEIVE ME i would not be doing the campaign on legendary this many times if the -Yoink!- online system were picking up that i have actualy completed it. Ive done all but 3 and 4 now apparantly on legendary, when i already have the achivement and have completed them all several times(also shown one my service record). im sick and tired of doing the same thing over and over just because of faults in the system, im only doing it for the Mark IV master Chief armour. What should i do because i should not be expected to complete these damn missions again, its ridiculous, especially when its clear that ive done it already. if any bungie employee’s can help me out here it would be much appriceated.