Citibank Bank Account Or Service Complaint

Citibank Bank account or service department,

Checking account Account opening, closing, or management Oregon

I made a deposit at Citibank. There was a $400.00 bonus for signing up and depositing $15000.00 and keeping it in the account for 30 days. The bonus was promised to be in the account in 90 days after meeting the requirements. I fulfilled the requirements and when the bonus was n't credited to my account, I contacted them by email and by phone. By email, they wanted 30 days to " investigate '' and by phone they promised to take care of the matter and credit my account. Months passed, I called again and spoke to a supervisor who now claims the account was n't qualified or something or another.