An actual mason did not do this. That shit is just squeeze bagged in and left. This can not be fixxed after the mortar sets. The joints need to be struck with the mortar still plyable. And not just to make it look nice. The looking nice is a byproduct of the actual reason you strike a joint. The mortar nerds to be pressed into the joints. Failure to do so will cause voids inside and also severely weaken the bond. This is horseshit. Fire this guy immediately. Do not pay him. Find someone else.