Bad attitude after causing unneccessary damage

Kyalami glass fitted 2 large windows, we had taken the old windows out in preparation. The fitters took it upon themselves to chip some remaining plaster of the windowsills and in doing so caused quite a lot of damage to the sills. This was totally unnecessary as they left a large gap between the window and the sill. The workers said they would tell their boss. Bev did phone me, shouting, very aggressive and arrogant, refused to take any responsibility, only interested in whether I had paid the balance. Unfortunately I had! I paid in good faith expecting better service. I had to pay a to get them fixed, even if they didn't offer to pay for this a little respect would have gone a long way.