A builder has incorrectly fitted a 90cm Bette metal shower tray into an alcove with a bifold door. He built the alcove (on a friday afternoon) larger than the shower tray and there was a gap of around 1 cm to all sides of the shower tray which he filled up with mastic. He has now ridden off into the sunset and it has started to leak like a cascade! We have a tower shower on the far wall.
Please let me know our options
Please let me know our options