Citibank Bank Account Or Service Complaint

Citibank Bank account or service department,

Checking account Account opening, closing, or management California

I signed up citi checking account last - for promotional sign up bonus. Basically I need to deposit $ - new money within 30 days of opening the account. Within 90 days, $400.00 sign up bonus should be posted in my checking account. However, it has been more than 4 months but the sign up bonus still has n't been posted. Contacted citi many times but it takes forever to give me an solution. NEVER TRUST CITI!