Xiaomi India — mi power bank 2i 10000mah red color edition

On 15 january 2020, i bought a power bank from mi store with. This power bank price is 1000. But after buying, i noticed that it's lower power mode is not working. After that i called customer care of mi, on this number [protected]. So they asked me to go to the mi service center and get this power bank replaced. After that, i went to mi service center in 17 january 2020 but they did not replaced my power bank. Mi company cheated on me. Please help me for replacing this power bank.

Please replaced my power bank
My name:robin singh
Date of purchase: 15/01/2020
My mobile no: [protected]
Email: [protected]@gmail.com