multiple entry visa

to whome it may concern
im traveling to china since year 2001 for bussiness , and due to my job i have to travel there every month , i used to get multiple visa easily and even in 2008 i had 2 year visa , but this year they refused to give me multiple visa altough i had the invitation for multiple visa. in addition im from iran and i have been liviing in UAE for almost 11 years. i would appriciate if you could solve my problem or arrenge a meeting with the consoule so i can solve this issue.
best regards farrokhy