H4 receipt received on April 18th. "On March 28, 2017, we received your Form I-539, Application to Extend or Change Nonimmigrant Status, Receipt Number LIN1714XXXX, and sent you the receipt notice that describes how we will process your case. Please follow the instructions in the notice. If you do not receive your receipt notice by April 27, 2017, please call Customer Service at 1-800-375-5283"