<prompt> Human: I live in a share house and the online payment system my landlords company has been using has been charging me 500 less than is on my lease each month, so my roommates and I have only been paying what the website had us pay. Now the lease is up for renewal, and hes finally noticed this error and expects me to pay the difference. Am I stuck paying the money or does this error leave me out of it?  <response>: Youre legally bound to the lease I would guess. Probably a question for a lawyer. 