Samsung — Samsung AC service

Pathetic AC service by samsung india. I had a issue with my AC of less coolness and called samsung AC support. They came and refilled the gas and checked for leaks as well and said things are ok. After one month, the coolness reduce and the second set of engineers now ask me to change the compressor and asking for 10000. Instead of spending 10000, I can go in for a new AC. I would want samsung india to reimburse the money that was used to fill the gas but now they don't want to do that and not taking up responsibility . Did not expect this from a MNC to have such a poor support