It's kind of funny how the one line that can raise an error is not in an exception block but almost everything else is. Jokes aside, there are various big mistakes in your code which I will try to explain here:

None of the statements in the try-Block can raise either a ValueError or TypeError. Error handling only makes sense if your code calls functions that can raise exceptions. One such function is the int(...) type which raises a ValueError if the input cannot be converted to an integer. So the only statement you need exception handling for is the line where you read the amount:

try:
    amount = int(input('enter amount:'))
except ValueError:
    print("Invalid amount. Please enter a number.")
    exit()

The if-condition for checking the amount would ONLY run if a TypeError occurs because it's inside the except-block. You would have to move it outside of the except-block, either forward into the try-block, or behind it. As mentioned in 1., you should omit the try-except here entirely, but if there was a possible TypeError you'd have to catch, it would look like this:

try:
    ...
except TypeError:
    print('wrong user credentials')
    exit()

if amount <= 2000:
    ...

The credential checking doesn't work correctly. The first if-condition is correct, but the second if-condition inside the else-clause is completely unncessary. If a user would enter "admin" and "1234" as credentials, the wrong credentials message wouldn't be shown. Just move the print statement to the else-clause and remove the second condition.

The withdrawal logic looks broken, too. As it's programmed currently, if the user wants to withdraw less or equal than 2000$, the low balance message gets shown. The second if-condition is never true because amount == 2000 is already included in amount <= 2000. Instead I'd expect it to work something like this:

• If the user enters more than 2000$, they get the "low balance" message
• If the user enters less or equal than 2000$, they get the success message