Isilon Quota Expand

Hi All I have a little trouble...I'm using Isilon X400 with OneFS 7.2.0.1 and activate the smartquota license....I create folder and set hard limit 200 MB for this folder with Show Available Space as "Size of hard threshold"...I mapped folder to user workstation and it show 200 MB capacity so quota working perfectly...Recently our customer want to expand directory quota become 400 MB, I edit hard limit become 400 MB but in our user workstation the mapped folder size become 120 TB(our whole cluster capacity)...I try to copy 1GB file and it can be copied to share folder so I think my quota doesnt work....Any ideas how to expand existing Directory quota configuration?..Thank you before