afni-subrugation department insurance fraud, we owe Chubb Insurance Company $12,519 regarding a loss to my downstairs neighbor Bloomington Illinois

Received a letter in the mail stating that afni subrugation dept is contacting me on behalf of chubb insurance stating that I am liable for payments that chubb insurance made to its policyholder as a result of a loss. chubb insurance believes that they are entitled to recover some or all of this money from me. the balance is $12,519.94. be advised that the balance may  increase if additional payments are made by chubb insurance. i reside in a co-op and have co-op insurance. my downstairs neighbr is named rachel weiss. if i had insurance coverage notify afni. if i do not have coverage contact  the office to discuss the further options