Bangkok Bank do NOT say that. Disregard this guy who keeps pushing people to an agent, I wonder why!
Requirements to open an account with BKK;
Savings Account (bangkokbank.com)
For foreigners
1. Foreigner with a work permit
Passport
Work Permit
2. Foreigner without work permit
Passport
A reference letter issued by one of the following institutes or organizations or required document
Embassy located in Thailand
An overseas bank where the customer holds an account sent via SWIFT
Trusted individuals such as a Bangkok Bank staff member or customer, director of a private company, permanent residence in Thailand, government or private educational institutes located in Thailand trusted by the Bank
Trusted companies, e.g., an employment letter from the company if the customer is in the process of applying for a work permit.
Document showing ownership of a fixed asset such as a condominium sale/purchase agreement (a condominium which is acceptable to Bangkok Bank) Or a property reservation agreement valued at 100,000 baht or more with a reference letter from the property developer that is acceptable to Bangkok Bank.
Notes: Contact addresses for both Thailand and overseas must be provided (hotel and P.O. Box addresses are not acceptable).