You have to make good the repair, it is a pig I put my toe to a small tile on a roof once and it snaped, I told the customer who came and had a look she looked at the roof and said you have broken loads, I said no only one but she would not have it. The cost was £70 to make good, hard to swallow for one tile.
But it is your reputaion at stake, how many people do you think this person will tell if you dont. She will tell everyone.
Roy