Apple India — macbook air (manufacturing defect)

Hello sir, i purchase a macbook air on 30/04/2018 after some time i notice macbook air heatup badly then i go service centre i venus adajan surat than they check macbook they say it has problem in chaarger and in motherboar and say this is manufacturing defect then i request for replace produt then they shouted and say it cant be change but why? If i gave full money for a good then why i take waste product. I want my new product not a defected product if my product will not replace i will suicide at ivenus