Samsung — Charging service fee even when no repairs possible

My Samsung fridge had an issue for which I raised a complaint with Samsung customer care. The technician came and inspected the system.
He said a part needs to be replaced.
Then he called someone and said that this part is not available and fridge cannot be repaired.
They still took 450 Rs charges from me for visit fee.
This is unfair. If you have no replacement part you should not charge anything to the customer.
I request samsung device owners to avoid samsung services and get it fixed locally with grey market parts when you have old devices that are more than 5 years old.