MakeMyTrip — Wrong information about offer mentioned over phone

Make My trip is selling festival promotion offer over phone,
On phone they are not giving proper information and ask to by offer on the spot.
I also purchased the same offer, at that time they mentiod that I can use the voucher for Air Travel tickets.
Now when I get the voucher it says vouchers can be used only for Holiday pakages.
From last 2 days I am trying to call them but no one is responding on given numbers.

Don't Buy any such offer over phone.