Nykaa.com — one product missing from order

I am a regular online shopper and tried nykaa for the first time and am really very disappointed with the horrible service and even worse customer care. I had ordered for 6 items worth 4161 through nykaa but got only 5 and one product worth 737 was missing. Immediately i chatted with the customer care and shared the photos and they said they will look into it.in spite of repeated reminders there was no response from them. I then called up the nykaa personal and she was so rude saying that i was lying and the product was sent by them. This is the first time i’m being cheated on online shopping though i’ve heard of many such incidents and a lesson well learnt. I am a regular customer of amazon and have not even once had an issue like this. Anyway once bitten twice shy!!