Xiomi — complaint against service centre chandigarh staff

I have two mi phone. One was not working. I went to mi centre chandigarh who checked it and said that though it was in warranty but liquid found, so warranty is over. I asked to repair it otherwise. He said approximately rs. 8080 will cost on repair. Here i want to mention that i purchased the same for rs 9000. Then i went to some private shopkeeper who repaired it and cost comes to rs.500 only. Now i want you to take action on such person namely mr. Yadav who inspect the same and such caused metal harrassment. Or i will take legal action for which the whole responsibility lies upon you.