Ajio — Missing order

Website: Ajio

I had ordered 2 products from Ajio app
The trousers were from Alsace lorrain with total bill of 1520/- but I just received a parcel with a missing order of green trousers and there is no option for direct customer care executive or even an option to complaint for the missing item
I would like to place a complaint against the app and my return against the same asap