I539 receipt notice sent to wrong address

[Sowmya I]

Hi

My husband's and my extension were filed by my husband's employer in August 2016. The employer provided my husband's receipt notice but I have not received it till now.

Employer is saying that address which I mentioned in the I 539 form was my previous address. USCIS might have sent the receipt notice to my previous address which I can't get by any means now. My current validity will expire next month. How to get this issue resolved?

Thanks