Micromax — Micromax tablet p650e

I have purchased micromax tablet from Poorvika mobile Kengeri setallite town Near shirke appartment Bangalore karnataka india after 2 days from purchase of tab charge redusing 2 to 3 % on every 5 minits . as advised poorvika mobliles ihave givrn it for repair in micromax service center namelysun Technologies chandra layout main road bangalore, three times they have reapair the same and once they changed battery and also Iam facing the same problem angain I givrn for repair for suntechnology they have send the tab to delhi two times but now also iam facing same problem.iam not using the tab even single day in service centre they told that replacement is not possible give me the solution