Hello.
Your credit card credit limit is 6,000, your cash withdrawal limit is 3,000, and you have to repay 6,000 before the due date. So how much did you owe before? If the previous debt was 6,000, then after you repay the loan, your available limit will return to 6,000, but you cannot withdraw the full amount because your maximum cash withdrawal limit is 3,000.
The credit limit is fixed, and what changes at any time is the available limit. Every time you consume and repay, the available limit will change immediately.
If the available limit in your card exceeds 6,000, the extra part is called the excess deposit. You can withdraw all of it. There will be a withdrawal fee for withdrawing this part of the excess deposit, but there will be no interest.
If you don’t understand, please ask. If you are satisfied, I hope to adopt it.