How do i contact unitedunited bank customer service? United Bank is committed to serving its customers. Any issues you experience are ours to solve and your financial needs are our opportunities. To speak with a customer service representative please call (770) 567-7211, 7 days a week, 7 am to 8 pm.How do i find my oneunited bank routing number? Simply contact your employer, the social security office or any organization that provides payments to you and give them the OneUnited Bank routing number (011001276) and your account number. Where is my account number or name on my card?How do i contact oneunited bank in massachusetts? Phone: (617) 457-4400. Fax: (617) 457-4435. Email: [email protected]. Web Site: https://www.oneunited.com. OneUnited Bank is the premier bank for urban communities with offices in California, Florida and Massachusetts.Does oneunited bank do the right thing by their customers? This is typical for the majority of the OneUnited Bank customer disservice agents that I have spoken with. There is no admission of error on OneUnited Banks end or attempt to do the right thing by the customer.