Issue isin Building Repair given to contracter Mahada. Our building is repairing given to contracter name

I have uploaded the photo this contracter is not doing his work properly after plaster their the crack in my building piller gallary I am also sending pictures of crack inside an d in floor Rcc slab have going down slowly I have given the letter to society again the contractor till now no action has taken from society Bustaan Apartment opp BEST Depo next to city center Mumbai Central East 400008