Are you sure it's laminate, could be something like amtico which would lift easier and with a lot less water than laminate would.
Amtico is much more resilient than Laminate and would not lift with water on it and if it was Amtico he would be looking at ten times the cost to replace.
I suspect it was a cheap laminate from somewhere like B & Q it would lift at the joins if water got in to it, it has probably cleaned countles times with a mop before you got there and you were just unlucky. The corners if lifting can be dangerous especially to small children and pets, sliced paws just adds to the problem and cost.
However it's not the customers fault and it has to be put right, first stop insurance and then go after Roy Rodgers of a 'floor layer' who
you employed.