Can anyone explain to me the poof of income letter from my bank confirming income of over 65k per month from foreign transfer.

I have had the most frustrating morning, firstly I went to the Bangkok Bank branch in Central Festival. Yes can do letter, sign some forms and come back in 90 mins, pay 100 baht. Half hour later I get a phone call, no cannot do letter, must go to branch where account was opened. Ok no real problem, off to Pattaya Klang.

Now the fun begins only one teller at the counter and took over an hour to sort this simple task, by now the queue was out the door behind me, people were clearly angry. After all this I’m still left without the letter and told to come back tomorrow. She said must pay 600 baht, I couldn’t understand for what🤔All I want is a print out of 12 transfers and the letter confirming it’s my account and costs 100 baht right?? Is this not a common request at banks?