Tech-Connect Retail Private Limited — issue with intex powerbank 11000mah received thru flipkart

I recieved an Intex Power bank 11000mah from Tech-connect retail pvt ltd thru Flipkart with Order ID:OD[protected] on 05-nov-2018. It has one year manufacturer warranty. Now my power bank is not working properly. Its not even charging like a 2500mah powerbank where it has 11000mah capacity. When i am charging my phone its getting discharge very early. This product is damaged my phone battery also. Now my phone also not charging properly.