Maharaja blender defaulty from Star CJ

I have bought maharaja blender from you in dec'11. It has already got operating problem in first month itself and I had to give to your local ahmedabad service centre for repairing. Now that same problem has again occurred in next 5 months. I am totally unsatisfied with the product and demand a replacement for the same. Bill no : 0044 franchisee of star cj network india private limited. Date : 02/12/2011 order 112&119 in indian corporation, mumbai nashik highway, village - gundavali, no : 7868