Medlife — prepaid order is modified without my consent and not answering my calls

My pre paid order or4410nga-002a was modified without my consent. I am unable to cancel it on app and i'm calling medlife customer service since last 10 days but no customer executive picking up call. Delhivery courier services personal who came to deliver medicines too requested for cancellations on their end stating customer has cancelled order still no use. I try calling medlife customer service number but they never connect me with any customer executive.
Please cancel this order & refund my money back. Highly disappointed with medlife.