Here is T-mobile's corporate address:
T-Mobile USA’s corporate offices, located at:
Robert Dotson, CEO
12920 SE 38th Street
Bellevue, Washington 98006
Attn: State and Local Government Affairs
or contact the FCC with your complaint:
Federal Communications Commission
445 12th Street SW
Washington, DC 20554
More FCC Contact Information...
Phone: 1-888-CALL-FCC (1-888-225-5322)
TTY: 1-888-TELL-FCC (1-888-835-5322)
Fax: 1-866-418-0232
E-mail: fccinfo@fcc.gov