Delhi Police — calls from delhi, complaining to be from delhi crime branch and using abusive languages for me and my wife

Dear sir/madam,
I recieved a call this 19th may 18 from number +91-[protected] name tamim iqbal claiming to be from delhi crime branch and using abusive languages threatening me to arrest me and my wife, without giving any info on the complain.
Asked me to check sanjay verma ([protected]) who claims to be a lawyer and dont have any info on the details.
Im in bangalore, and told them to pass me the fir/ summon and i will talk with local police but they are in tone on abuse.
Kindly help me out.