It’s not a surprise that there are many questions and a lot of confusion around the EIDL increase questions. While there is an 800 number, it seems that these reps are trained to tell you to send in an email to get any questions answered.
If you think you made an error in your application, were denied for “unverifiable information,” or haven’t heard anything, email firstname.lastname@example.org or email@example.com. (They go to the same place.) Note your application number in the subject line and attach the denial letter if applicable. The email body should include loan number, company name, owner name, address, and contact information. If you cannot see the button and believe you are eligible for an increase, email CovidEidlIncreaseRequests@sba.gov. The customer service email for any other matters is firstname.lastname@example.org.
When will your email be answered? That is anybody’s guess.