The Shopping Bazar — the order was never delivered

Website:

theshoppingbazar.in

I placed the order on 29/8/2019. The item was a dress of code dress-18. After paying online i got the following message from them:

Hello soumyashree, thank you for placing your order #37643 with theshoppingbazar. Your order will delivered to you within 13 to 15 days. Need help contact [protected] or email us [protected]@gmail.com.

Your order will be delivered to you on [17/09/2019]. Need help contact [protected] or email us [protected]@gmail.com.

But the order was never delivered. I tried to contact them through phone or mail, but of no use. Please tell me what i should do regarding this matter.