How do i contact seiu? Contact Your Union! One phone number to reach the Member Assistance Center, Member Benefits, or to reach another department or staff member. 1-844-503-SEIU (7348)How do i contact seiu local 721 member connection? Los Angeles, CA 90017. Phone: (213) 368-8660. Member Connection organizers are not stationed outside of the main SEIU Local 721 office – but you should feel free to contact any of our district offices, if necessary.What are the benefits of seiu membership? SEIU Member Benefits—A new benefits program exclusively for SEIU members! Manage finances better: Get competitive rates on everything from credit cards to personal loans. Protect your family: Benefit from group rates on a growing portfolio of insurance products. Cut your cost of living: Get special discounts at thousands...