Kelvinator — very bad service and amount charged unnecessarily

Product no. Kre202 recently some problem reported with our refrigerator then we requested a service by calling dealer and customer care. After so many follow ups on 2nd august 2017 one guy came to my home and replaced the compressor and he said it is under warranty so they did not charged for it. But he charged 2100rs for some gas and his charges and when we asked for bill he refused and left. After just 30 mins product again stopped working. Then we tried calling a service guy, dealer, customer care. No one responded yet. Service person no:[protected]. So again we called customer care then they said complaint is still pending they will arrange some other person on 07th august but they failed this time also. Today also i called then they given below numbers to contact (Area managers0. [protected] (Unable to reach) [protected] (Not answering the calls) complaint no. Hyd[protected] 1) why they did not provide the bill for what they did? 2) whom do i further contact to fix the problem? Thank you