A brokerage has correctly been using my mailing address in past years to send my 1099. Then this last tax year they decided out of the blue to send the 1099 to the address of a family member (where I sometimes stay).

I find it revolting they would do this. I cannot expect that family member to handle my mail for me. So I have sent several written requests for them to send my 1099 to my mailing address they have always used previously. They just ignore my letters.

Is there any recourse? Is there a regulatory agency who I can complain to?