bad service and violating commitment

Location/place: West Bengal, North 24 Parganas, Ichapore

Name of company/service: Next G-Interiors 310, Canal Street, Holding No.- 483/3, Lake Town, Kolkata -48, near Daffodil Nursing Home

i have been purchased a modular kitchen from this company. payment was completed on 02/03/13. but they are delaying now and they are not completing their duties. Please do needful.