Not received I-94 extension I-539 acknowledgement letter

[ramamurthyb]

Hi,
I am Ramamurthy entered US for the first time with B1 Visa on 02.Apr.2010.
Immigration officer stamped 01.May as the departure date. But I needed 3 months.

I applied for I-94 extension through I-539 till July 15 by paying $300 through mail on April 27th.

I have not received acknowledgement letter even after one month till now 1st June. I am leaving US on 26th June.

Can you please clarify 2 questions:
1. how long does it take to get acknowledgement letter.
2. Is acknowledgement letter mandatory while leaving US. If I dont get 1-2 weeks before my leave date, then how I can proceed to get acknowledgement letter

Thanks in Advance,
Ram.

 

[Triple Citizen]

A1: Depends on the service center being used. Compare processing times with your filing date.
A2: No such requirement.

1. how long does it take to get acknowledgement letter.
2. Is acknowledgement letter mandatory while leaving US.