Had a furnished flat. A stain on the curtain was written on the inventory report when I moved in. The report simply says a stain was found on the curtain. Now the landlord said the stain got worse/darker and he wants to replace the entire curtain and wants me to pay some of the replacement cost. But the curtain stain is the same as before. The inventory report is all we’ve got and I’m not sure if he has any ‘before’ photo, because he has not provided any proof so far. I believe the onus is on the landlord to provide proof, otherwise I should not pay. Please advise on the procedure forward.