Medlife — reimbursement of my money paid

I have made online payment to medlife for the medicines i ordered. But while delivering the medicines the delivery boy said that it is not a prepaid order.
On there app it was shown that the order was prepaid & i am communicating with them & they are agreed that the money is paid. They also agreed to return my money but making too much delay in returning it. Now approx 2 months are over & still my money is not returned