Maruti Suzuki India — delay of repaired car delivery on insurance claim based

I have submitted my maruti suzuki model a-star rto no gj 27 c 5650 for repair with insurance claim on dated 08/10/2017. But kataria automobile khokhra service center, ahmadabad has given me delivery time with repair after diwali. The reason was given that spares of "a-star not available in this service station as company is not in position to provide it. Further to inform that back side bumper and its base and break and signal light are to be replaced.in the time of diwali festival i need my car but due to non availability of spares the delivery can not be possible before diwali.
Further reply to extra key was that the company is not in position to supply.in thew matter in no option i approach to you to resolve my complain time being.