Hey shreshth_1,
We understand that you're having issues with calls on your Mac device. You'll first want to ensure that both your devices meet the system requirements for Continuity, which allows you to take calls on other devices besides your iPhone:
System requirements for Continuity on Mac, iPhone, iPad, iPod touch, and Apple Watch
This article also has additional helpful information about making and receiving calls on devices:
Make and receive calls on your Mac, iPad, or iPod touch
If the issue continues or if we have misunderstood the situation, please answer the following questions to help us better understand what is going on:
1. Does the call have appeared to transfer successfully to the Mac, but you're unable to hear what the person on the other line is saying?
2. Are you using any headphones (wired or Bluetooth) with your Mac after transferring the call?
Take care!