Capital One Bank Account Or Service Complaint

Capital One Bank account or service department,

Savings account Account opening, closing, or management Delaware

I received invitation from Bank to open Savings Account through - mail. I applied Online for savings Account, I met with an error and it advised me to call them. When I called them, they denied the Account opening saying I do not have sufficient history from third party regarding my SSN. I asked them if they can send an email about denial or if I can send more documents, proof to satify requirements. They simply said No for everything and denied Account opening. They simply said we cant help. I have excellent credit rating and I am clueless about what happened.