[Resolved]  Askmebazaar — mi 20800 mah not working properly

Sir, please help me.. please i have purchased a MI power bank ( 20800 mah Rs. 949 ) from Askmebazaar online market[protected] but they cheat me.. the power bank can't charge a single mobile. ( 20800 mah means that can charge 8 smartphones ) then i complined them via phone.. but they told me that they can't do anything becouse of 4 days gone.. ( 48 hours is their chekking period ) in case of power bank; the power bank needs minimum 20 - 30 hours for one time charging.. how could we ensure the product checking without checking two times thats why the time gone.. sir, i need to refund my cash or replace a good condition product.. sir, please make an action for this..