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.
Once the Summons and Complaint have been served, the defendant usually only has 20 days to respond by serving a written Answer on the plaintiff. A phone call to the plaintiff or plaintiff's attorney does not meet the requirements for an Answer under the rules. See Rule 5.02 of the MN Rules of Civil Procedure. The defendant can call the plaintiff's attorney to ask for more time to serve an Answer, but the plaintiff might not agree to more time.