Medlife — repeated calls from customer care even after repeated requests

This is with regret I am saying how a Medlife services company are spoiling their reputation by calling customers everytime and all the time, bugging for new orders.
So far I have good experience in delivery and that too on time.

But totally frustrated with with their services/support person calling on hourly/daily basis and asking if I have new orders. They will do this even after they know that I have placed order recently. Is it food that I order on daily basis?

Several times I have poured my frustration and they have told they will add my number in DND, but no luck