You did some editing of your very poorly written post,but maybe you should edit the last part starting with "How quickly...." Reading it and trying to understand it gives me headache.
With your attitude you should maybe stay in Kazakhstan. And before you click on the blue arrow read your post and check for errors, because there are a few.
And I repeat, there are ~85 immigration offices in Thailand. You're claiming you went to one of those and got a letter which is imo not an official procedure. What rules did your bank check out? Please tell.
It's way easier (and faster) to go to Laos and apply for a 90 days Non-O. No need for a Thai bank account. Then return and open a bank account and deposit the money needed at immigration.