Question about bankrolls and banks

I feel like my bank is playing games with me. Last week, I gave them advanced notice that I was withdrawing most of my money from my account and they said that would be fine, and I could get it today. Now today, they said I have to wait another week and a half to get it. I was going to keep the account open, now I'm so angry that I am completely closing it.

Anyone know how long, legally, they can prevent me from getting money that is in my checking account?

What can I do to get my money?

They made me put it in writing that "On April ?, 2004, I, _____, will be withdrawing (amount in $) from my checking account. Acct # ???? . Then I had to sign it. I feel like I was harassed today. I feel like I need a lawyer or something.