Medlife — refund of order id or6562fla-001a

I ordered medicine Medlife on 18th April 2019, and delivered on 21st April, 2019. I found 4 damage medicine. So I returned my medicine. The courier company (Ecom Express) pickup my medicine on 07th May, 2019. After that I mailed to Medlife company so many times. But they did not refund my amount yet. Sometimes their representative call me and told me you will get your refund amount within 4 to 5 days in your medlife wallet. Every time they cheat me. So I request you that please take some action that I will refund my amount. Thanks.
I enclosed my courier pickup snapshot.