Bothered and Bewildered! !

I went into MY bank, the HSBC and withdrew money from the cash point. I needed to exchange the notes for one and two pound coins. I walked towards the teller point and could hear shouting. It was an assistant trying to get my attention.
I said that I needed to exchange the note for coins.
I was promptly told, “the bank do not handle cash.”
“But you are a bank! My bank”
“But we do not handle money” said the assistant while looking at me as though I was the mad one!
“I need coins! You are a bank!”
“You can try the Post Office! she replied.
I had to keep my dignity in tact and not allow the temper rising in me to surface and leave the premises furious and bewildered.