Who is liable for wrong advice

Electrician was called to rectify repeated blown fuse. Provided details about: 5 sockets and 2 heaters connections. The electrician did not check any of connections instead went staight on the fuse box. Replaced fuse box adding type of box is very old and was cause of fault, To avoid fuse blow up he showed that the fuse holder should be inserted bottom /top first and not all 4 pins at once. Replaced fuse and left. Around half hour later, fuse is blown again. Advised that a new fuse box with circuit breaker is required so that he can check sockets/heaters connections! Advice given without making sure that problem has been identified. Cost for the lot including installation £260. Came back in afternoon and took ages to instal new box. Power is switched and circuit breaker is tripped again. My conclusion there was nothing wrong with old fuse box. Who is liable for the expense of the new fuse box and the installation work? Fault has still not been located