The biometrics appointment notice may be sufficient. However, there is no guarantee USCIS will accept the notice as proof the application is pending. You should contact USCIS again or retain an attorney to assist you with this matter. Our office has successfully requested copies of filing receipts that our clients did not receive.
I agree with my colleague.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.