Addmecart — Not delivered product

I have ordered OnePlus Nord 2 5G mobile on addmecart.com website on June 27th 2022 with order details mentioned below in the pic. It has been almost one month till date and I didn't recieve the order. They are not even responding through phone. I have tried all the ways to contact but them there is no response. The delivery partner is delhivery.com and they are not responsibly handling the situation. So please help me out of this situation by taking action as soon as possible