How to file a complaint?

I went to my old agent, he gave me a number to call, about my roth IRA. So i did what he told me . I did what the lady told me to do, new address, send me a copy of my statement, since i have not got one in appox. 15 years and i also requested the interest rate at the time I opened the account and what iam getting now, good thing i made a copy of letter I sent you. The letter your company sent me just referred me just me back to a agent i haven't talked to in 15 years, cause hes not a good person