Dewan Bajaj — Worst service done for Bajaj 180cc Avenger in Chattarpur Dewan Service Centre

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Dewan Auto, Chattarpur Service ( Deepak Auto Chattarpur Delhi Code-07

I went for Avenger 180cc service in Chattarpur(Deepak Auto Chattarpur Delhi), I told them to get the proper service done for my bike. I just mentioned that oil is leaking from my bike and need to check and fixed it.
They took my service for bike, open all the parts, from the engine to oil tank and then mentioned that parts needs to be changed and in-return they gave me the bill of 10209/-. As I always had the full faith from Dewan Auto & Bajaj Service Centre, this time also I paid the amount. After service, my bike condition is worst than before I gave it to them for service. My bike is making worst noise while riding and pick up is completely gone from bike. There's no pick-up, My bike is not able to get proper pickup and can't go above speed of 40. While coming back from office I almost went into accident because of no pickup in my bike and it is slower than a bi-cycle.
it is one of the nightmare I am having after taking service from Dewan Auto in Chattarpur (Deepak Auto Chattarpur delhi Code-07)