HYUNDAI India Motors limited - TAKING 1 months for minor accidental repair

I have given my car for repairing to the service station in hurry he wrote * months waiting i contact him that told about that service guy kapil said its normal work which will be done in *-* days but didnt done the work after ** days i told him to get done work fast but they were doing the work of those who giving them *** rupees extra.i complaint for same but after that day they all neglecting to giving me the car back and asking to sign the satisfaction letter for them