Kaff Appliances India — Damaged the base while servicing and not replacing it

I had complained to Kaff regarding my h
Hob igniter which has been giving me problem since the day i have purchased the Kaff Hob. Also i wanted to adjust the flame.
Service person came and could not take out the screw and said he would need to cut the screw to open the hob.
We permitted him to cut the screw but he damaged the base in the process and left the half cut screw as it is and serviced and left.
We noticed that he had damaged the base a few days later n now he says we may need to change the base.
Whose responsibilty is it to pay for the new base.
It was the service person who damaged it but he says we need to pay for the new base.
Is this how you Kaff does service for their appliances?