Extremely poor customer service - Business Online

I have been trying to get in contact with our business banker for months in order to make changes to signatories and get a bank letter! On calling the call centre they are unable to assist. Even being given a number that does not exist. After eventually getting email addresses, the response was merely, this person has been assigned to assist you, to then not get any further response. Extremely disappointed with the level of service from such a 'reputable' bank. It is clear that their internal systems are not conducive to customer care. Furthermore the Business online application is very basic and does not offer even the basic functions for self service such as generating a bank letter.