Dear Bank

if I wanted to do something at the automatic teller machine I would go to the automatic teller machine and talk to it.
I have come into the bank and I expect to go to a human and talk to the human. I also expect to be served politely and efficiently - and yes, I will be polite in return.
I do not wish to be bullied, patronised, or treated with contempt simply because I refuse to use the fancy new ATM.  The ATM can be seen by all and sundry. It has been placed in a location where others can read the screen as they pass because they have no choice but to pass too closely. There have been complaints. You say you can do nothing.
You, dear bank, have the Senior Cat's money in your possession. You make money from that money. You loan it to people who pay more in interest, much more in interest, than you give to the Senior Cat. Shares in the bank are doing extremely well.It also means people can build houses and businesses and buy cars and do all the other things that keep the country running, including paying your senior executives their highly inflated salaries.
But it is still the Senior Cat's money and that of everyone else who has a savings account with you that allows you to do all this. The Senior Cat has a right to be served by you. I, as his nominee, have a right to be served by you. 
I do not expect to be told off in front of other customers. I do not expect to be told that it is "my fault" if delays are caused. Nor do I expect to be told that I do not know how to transact the business I wish to transact. I know I don't know how to do it.  What I do know is that it is going to take a human, not a teller machine, to do it.
Yes, I have come across this particular employee before. We have clashed before. It isn't just me. I have seen her clash with other people. There was a major argument one day. I could hear it while I was waiting in the chemist shop opposite. Other people could hear it too. One of the two remaining tellers apologised later. There used to be four tellers in that branch of the bank. Now there is only one on duty. She has to deal with the elderly and the frail, the intellectually much less able and those who need to do out of the ordinary transactions. 
And no, dear bank, you cannot expect my friend R... who is unable to read or write to work the teller machine. It has taken a long time to teach her how to go to the bank and get the money she needs to live a week at a time. Telling her she had to use the teller machine reduced her to tears. She needs the understanding of a teller who will give her the money in a form she understands.  The girls in the local supermarket help her do her weekly shop. It is little things like that which mean she can live almost independently in the community. The manager there has more respect for his customers than you.
Yes, dear bank, I am angry. You are not serving your customers.