Trai — stolen phone

My new handset (Redmi 4) was stolen on[protected]. I was using a vodafone sim. I asked vodafone to block my sim and asked them to blacklist my imei no as well. They clearly stated that they will not block/blacklist the imei no for my stolen phone.

I have already lodged fir for my stolen mobile handset and can provide with the fir copy as well as the phone bill with the imei

Whom do i contact to get my imei blacklisted?