Scar tissue on the ear drum is usually caused by repeated ear infections. The scar tissue can lead to difficulty hearing and eventually ruptured ear drums. Surgery is one means of avoiding progressive hearing loss or ear drum rupture. No patients have reported taking Scar tissue removal (eardrum).
USCIS normally responds to RFE's within 60 days, however they do not have processing times on how long it takes them to respond. It can be longer than that. I would call the USCIS number: 1 (800) 375-5283 and submit a service request, if you do not hear from them soon.
Exede offers a number of ways to get support, including the usual options: online chat, email, and phone support, with average wait times listed next to each option. Chats are said to start within one minute, email responses are promised within 24 hours, and there is a 2-minute average wait time for the good old telephone.