Reliance Digital — Order delayed with no action taken

I ordered a Casio CT S200 piano from Reliance Digital online store on 9th of August and was supposed to get delivered by 17th of August. From 12th of August, it's at a delivery facility in Hyderabad and there's no moment on it from last 8 days. I tried reaching out to delivery service named "Delhivery", they are also not responding to the complaint. It's terrible. I could have instead ordered from Amazon and it was a little cheaper on Reliance Digital but now I am suffering because of this. I literally check my status of the delivery 100 times a day, they are wasting my lot of time and not helping me.