FINALLY!! I received my RFE.... so.. it says that the evidence i submitted lacks documentation for 2007. So they want the whole 2007?! Well... I do not have much but i need your help.

I originally sent cell phone statements for 2007 but guess that wasn't enough. I was working under the table that year so I asked my friend who was my co worker back then to make me a letter stating that I worked with her from July 2007 to November 2008. I don't know if I should get it notarized. I can't get a letter from my employer because the store closed in November 2008. But I am also planning on getting a letter from a friend works next door to where I used to work, saying that he would visit me at the store. I also found 2 bill statements dated May 2007, and February 2007, just that they are "final notice, payment past due notices" so idk if to send those. One is from my previous university and one is from a cell phone company. I don't want USCIS to think that I didn't pay because I wasn't here, get me? Anyway, I am also planning on sending once again my cell phone bills. And I used to work with a fake social for 2 months in 2007 So i have a "Form W-2 Wage and Tax Statement, but it shows the fake social that I used. What do you guys think? I am so frustrated!