Medlife — amount for missing product not refunded

We have Ordered Medicine on 28th December which got delivered on 29th December however one of the medicine costing 1000 not included in the packet however charged for same. Upon filling complaint against the same they promise that the issue will be resolved in 24 hours but it's been 6 days now still issue not solved and amount also not refunded. Every day they are just ignoring by stating the same statement that we are looking into it and every executive is giving false statement. So I would like to submit a complaint against the Medlife for cheating me by making false statement and not refunding the amount till date and giving me daily new date