Its not a good job, they've clearly just tried to get it done as quickly as possible and either not paid attention or not cared. Looks like they've used an angle grinder when an arbour saw would have been more appropriate.
Edit, yes they've used an angle grinder. Any suggestions on how to approach this appreciated, the damage is done to the bricks now, but equally the job is only half way done, so I'm not about to kick them off site.
Not sure what to tell you really.
Its not a good job, they've clearly just tried to get it done as quickly as possible and either not paid attention or not cared. Looks like they've used an angle grinder when an arbour saw would have been more appropriate.