47 C.F.R. § 7.22 Formal complaints based on unsatisfied informal complaints.
Title 47 - Telecommunication
A formal complaint filing based on an unsatisfied informal complaint filed pursuant to §4.16 of this chapter shall be deemed to relate back to the filing date of the informal complaint if it is filed within ninety days from the date that the Commission notifies the complainant of its disposition of the informal complaint and based on the same operative facts as those alleged in the informal complaint.
Title 47: Telecommunication
PART 7—ACCESS TO VOICEMAIL AND INTERACTIVE MENU SERVICES AND EQUIPMENT BY PEOPLE WITH DISABILITIES
Subpart D—Enforcement
§ 7.22 Formal complaints based on unsatisfied informal complaints.