Dell India — Purchasing desktop dell inspiron 3891

Address:

Village-Bhanakpur,Ballabgarh,Faridabad,Haryana(121004)

Hello,
I purchased CPU inspiron 3891 from dell store.First they asked purpose then i told that i am software developer and i need this for development purpose then they sugest this model. After purchasing when i start worked on it i observed that its very slow processing CPU even if i double click on file then it takes 5-10 minutes. then i complaint for this but they not ready for replacement or return. I suggested that its very slow, i can take new laptop but i dont want this cpu, But they not ready.Please help regarding this.