paid servicing problems

sir this is Dr.Sankalp Bhandarkar we own a WAGON-R LPG model of 2007 and has a warranty of 3 years which is valid till date i had purchased this car from navnit motors thane and i am repenting till date sir now latest problem is my lpg kit is choked earlier too we had repaired it from navnit motors emi workshop thane but now they said we are closed till 31 so go to THANAWALA SERVICING A BRANDED MARUTI SERVICE CENTRE IN THANE AND SHOW i did so and now a person in charge there called SUDHIR says that LPG kit was made direct and spare parts are missing from the car and says it is fault of navnit showroom workshop who did it direct in last servicing NOW U TELL ME WAT WE HARD EARNING PEOPLE SHOULD DO SOME OF UR CERTIFIED WORKSHOPS DO SUCH BLUNDERS AND SOME SAY PAY NOW 3500 MORE AS SPARE PARTS NEEDED TO BE ORDERED TELL ME WAT TO DO PLS SIR BEING A DOCTOR I REQUEST YOU TO TAKE ACTION OR ELSE WE NEED TO GO TO CONSUMER COURT AGAINST YOUR CERTIFIED WORKSHOPS WITH ALL THIS PROOFS THANKING U