Apply green card for parents currently in china

i submitted every supporting documents to nvc last July, after a long time waiting, there is no updates on my case. The customer service at nvc stated it has been submitted to the supervisor, but no updates either. The customer service suggested me to submit everything again. What shall I do? It is really frustrating. 

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• Reply -863211- ♂ (464 bytes) () 01/25/2016 postreply 12:32:52

• thank you very much for your help and patience answering my ques -angela1- ♀ (0 bytes) () 01/25/2016 postreply 12:37:39