Bajaj Auto — Broke spark plug in engine while serving

Address: Barwal motors delhuroad teh joginder nagar distt mandi 175015

Few day ago i went to authorise service station for service my bike when they do servicing they broke half sparkplug in my engine nd then they said its all my fault owner have to pay all the faults its owner own risk . Nd when the spark plug not comes out they said we can't do anything u have to carry out the engine outside and you will have to done work from market local shop. Why would i will pay off to do that things even its not my fault. Till now my bike in in there service centre with no work on it . Even i contact my time to customer support executive bajaj they raised a quary, complaint but they didn't contact me from there side.