Vodafone India — sim migration

Address:

Mumbai City, Maharashtra, 400003

I wanted to migrate my sim, from postpaid to prepaid
But was told that as per the trai norms you can do it after 90 days of service but now at the local store at mohammad ali road they are denying it and forcing me to continue postpaid for another one more billing cycle.
There at store they also behave rude behavior.
I have been on postpaid from 26 may 2017 till 26 august 2017 and have completed 90 days.
Please register my complaint and give me a docket no.
I want the migration to be done asap i dont want one more billing cycle
My mobile number is [protected]