Your rented a place with the expectation of a functioning dishwasher. It was not functioning.
You made a verbal agreement with an agent of the landlord to permit you to spend up to $300 to replace it with a new one with reimbursement from the landlord upon submission of a receipt.
ERROR: Verbal agreement
You spent over $480.
ERROR: Unilaterally overspending the agreement
You deducted the full $480+ from your rent.
ERROR: Claiming full reimbursement and failing to limit your reimbursement to the authorized amount
Now, the landlord, who didn’t want to pay any amount in the first place, is facing a claim for $480 instead of $300 max. He may have reluctantly paid the claim if you limited it to the contract amount of $300. Instead, he recoils and denies the verbal agreement in its entirety. The landlord’s agent is his relative, so you can guess which way his testimony would go if pressed.
If you go to court, you have a he-said-she-said situation with nothing in writing other than the receipt. The burden is on you to prove up the contract and its terms.
You will argue, “Why would I buy a new machine unless the landlord permitted it?”
The landlord will argue, “Why would I permit the purchase of a new machine when I could just replace the hose or replace the machine with another one I have in storage?”
You see where that is going.
You want to remain on good terms, so coming to an agreement is the best route, especially since going to court looks like it may be a total waste of time for you. You might ask the landlord to honor the $300 agreement and you eat the rest. If you don’t like that one and you take the dishwasher with you when you move out, you may end up with a fight over whether that dishwasher was a “fixture.” Maybe not. Maybe the landlord deducts the “fixture” cost from the security deposit and you are left to fight the landlord over the security deposit refund. Another possible arrangement was suggested by pbbth.
So many landlord-tenant disputes are based upon so-called verbal agreements. Another vote for lesson learned … get it in writing.