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By having a voice , email and chat support. As the bank needs more customers but do not want them to come crowding into the bank (everyone follows the concept of brick less banking now a days, )these are the means of remote communicating.
Training
And trying to understand what the customer needs
Pettmah and the relationship between the bank and the client to provide all the means to provide the service
These days online media and in particular social media and the use of application in smartphones has brought a great change to perceive things and got consumer/customer/client just a click/tap away. So one who fills the gap by properly applying technology that is mingled in the right way with his/her work then they shall do wonders.