Vodafone India — my vodafone number allotted to other customer without intimation

I have been using the vodafone number for last 6 years. Unfortunately due to unforseen reasons i was not able to use the phone for last 2 months since i am abroad. Just came to know from vodafone that my number is inactive and it is already allotted to some other customer without even intimating on the email.

This is totally unprofessional and it clearly shows that vodafone does not care about their customers and just wants to make money.