Vodafone India — mobile number trapped

Address:

W/o Achyut Hegde No 138/1, INDO NEST APARTMENT Flat No-105 College Bellandur, 560035

Hi,

How to know if my mobile number is trapped and someone listening to my calls?
Its serious problem am facing and causing problem is using phone as someone listening to my calls and tried hacking my confidential data.
Bank details also.
I have noticed that if i et any calls, first someone else spoke and i was surprised to see my calls running with different person said "hello and asked me if am priya/someone", then after 2-3 attempts they disconnected and my sister was shocked too as she too said someone else receives cal first and 3rd time was connected to me.

Please address this issue and tell me how to deal with it, else should i contact nadal officer/crime branch.

Please advice