Airtel — mobile number portability to prepaid

Address: Deloitte Tower 1,Meenakshi Techpark, Survey No. 41,, Gachibowli Village, Ranga Reddy District, Hyderabad, Hyderabad, Andhra Pradesh, 500032

Store location : gachibowli, hyderabad.

Whenever i try to go to store and ask to port my sim card for a prepaid connection they always deny saying sir prepaid server is down you take the postpaid plan.
And this way these people are trying to sell out postpaid connections by way of cheating