We're happy to help people with requests for evidence. A request for evidence is what uscis sends out, when they don't think they have enough information, that they've requested, or that they don't necessarily believe something that you're trying to prove to them.

Either way you have to address it, or your case will be dropped. You have already incurred a delay, because they've issued that request for evidence. You don't want to lose your filing fee, and everything. So, it's important that you properly address that request for evidence. The best way to do that, is to get some skilled help, and get an immigration attorney involved.