Instead of asking where you can get ur AEG fixed by a store, perhaps you should ask whether there are any 師兄 from this forum who can fix it for you, coz it's not worthwhile for you to spend like $2-300 for fixing a chinese AEG.
Based on what you described, it is likely that there r problems with your hop-up unit...so maybe all you have to do is change a new hop-up rubber or the entire unit.
