Flipkart — Im complaining about return for defective phone realme 7 pro

This is regarding order id OD[protected] which is realme 7 pro mobile purchased from flipkart. Issue with the phone is when I play music or while talking in calls I'm feeling vibration on the back side of the phone body which is intense that I feel irritated to hold phone .So I asked for return request which they provide replacement as their policy by techician visit confirming issue does exist .But, problem is when technician visited he does mention this vibration issue is there in all these realme 7 pro model .please help me with refund by taking faulty product.