Having the exact same problem. Check out my profile/posts on this topic. Sent in 3 months of statements with a bank managers business card, just in case they needed to call to verify. I have even offered to have a live Skype session with screen share turned on, log into all of my accounts (Bank, PayPal, eBay, etc) while in session, to show guaranteed source of income and sales. They never took me up on that offer, which is strange, because it would GUARANTEE proof of income.

They also turned down my year 2014 1099 form, which is an official U.S. tax document. Verifiable, because it is submitted to the IRS, and/or they could just cross-reference sales history/numbers with PayPal account on file with them. Unfortunately, that one got returned as "not the required type" also. Even though that is exactly what they ask for.