Mothersparsh — One face mask received instead of 2

I have ordered for rose and beetroot facepack in offer of buy 2 and pay for 1 . When I received delivery there was only one facepack in sealed box.
I have mail to [protected]@mothersparsh.com email id but noone has reverted on my email.when I contact on phone they said that we will check in our cctv and after checking in cctv footage they told me that we have delivered 2 pack in sealed box while i have received only one .
I told them mothersparsh has cheated on me . I am regularly doing only shopping but this type of misshapen never happen with me . I trusted mothersparsh but the customer care number lady told me that i am cheater .
How can you blame a customer that customer is cheating and customer is lying.
I have paid 380/- for 2 facepack as there was offer on the product that buy 2 and pay for 1 .i have called on number [protected] and lady told me that you are lying as we have dispatched 2 quantity.Now whome i can complain as this is not the question of money, this is matter of my reputation because i am not lying.