Our shower gets blocked everytime we do the dishes or do the laundry, whatever goes in the kitchen sink, comes out through the shower drain. So we asked the agency to send someone to unclogg the drains, which they did. We asked the people who came to do the unclogging, if it was our fault that the pipes got clogged, and they said that it wasn’t our fault, and the draining sistem was not done very well. After this, the agency sent us an email, letting us know that they are charging us for the repairs, since they found some fat in the drains. According to Section 11-15 of the Landlord and Tennant act 1985, the landlord is in charge of keeping the installations in the premises in repair and working order. Are they allowed to charge us for this since the people that fixed the draining said that it wasn’t our fault it got clogged? Thank you in advance.