Used a Legendary RP boost Didn't get rewarded.

I had a Arena legendary RP boost. I played a game of SWAT with the boost equipped. After the game it shows 0 boost, and only 728 RP gained. If it helps which it shouldn’t I had 17 kills 1 assist and 5 deaths. Also I did level up to level 60 during the same match. After the match my legendary boost has disappeared. Is there anything I can do about this to get my reward?