a woman offer me to complete my procedures of visa application.
she know my name, and my email and my phone number

Got a call from this number this morning. The lady had a very heavy accent. No clue where she is from. She was asking me about my immigration status or whatever. Barely understood her because of the accent. However, since she knew that my school helped me to send all immigration documents ( She even did not know F1 means student visa), she tried to hang up as soon as possible.

BE CAREFUL! They claim to be from US immigration and will try to scam you to get applications going.

ACCIDENTALY CHOSE A COMPANY  ...www.us-immigration.com
found out they were not the official us immigration after I had filled out a form ( to get me started)....they have tried to call me from this 415 number 5X plus emailed me...with a 1-866 379-7218 ext 369...they want my credit card number....BIG SCAM!!!!!

thanks so much for the tip, i would've been scammed! good thing i stopped when i saw the page to pay.