harrisment

Record such conversation and you can report if you receive such harassment.

Another alternative, you can make a Police complaint stating that you are getting harassment and threatening calls and ask them to keep your phone under observation and they can themselves monitor and can find the real culprit.

Use a different SIM and Number for your personal calls and never provide such numbers to any one.

He may be overawed by his father-in-law, but why should you be?

Collect evindences and report the matter to your employer as well as local police.

It is advisable to consult and engage a local prudent lawyer for appreciation of facts, professional guidance and necessary proceeding if the story is true.

is it govt office.