Hey @Rajwinder30, Alex here, welcome to the community!
If you're having a hard time hearing our customer service when calling us, you should try the other contact methods we have, like the live chat or on social media. We'll be able to help you figure out what might be causing this.
You can see all our contact methods here.
Hi @DavidJ2 !
That's odd. 
Does this happen with every person you speak with?
Also, did you notice a difference when you put the call on speaker?
It could be an issue with your device's microphone, but it'd be best to first make sure that it's not caused by the network connection itself.
A good test for this is to try your SIM card in another phone, to see if the same thing happens.
Keep us posted!
