Client not paying the balance
 

I would like to know if the client have enough reason and rights not pay his balance?
He accusing me for changing his password on his site
Is this client making an alibi to run with his obligation with me,
because i don't have any motive doing it so! and my biggest mistake
I even use his server for live testing and i will never ever do it again.
it's my negligence.

Let say i mistakenly change it for debugging and testing the site.

But i'm not sure if I do It, But if I do it by accident will the client have the right not to pay me?

You pay for your education one way or another. ..

Not enough information about what happened to help you, if you have a lawyer you trust it would be wise to get their opinion.