Airtel — port from 3g to 4g

Address:

Ludhiana, Punjab, 142026

I have poted my sim from 3g to 4g and i went to airtel store in jagraon ekta communication regal market jagraon and they took 100 rupees from me to port this sim from 3g to 4g where i got message of free porting my no. Is [protected] and i want my money back or i will case on this ekta communication and i had also told them to give me this sim free but they said that we took 100 from each coustmers and they also told that ask from every shop and i asked from 2 - 3 shops and they told me that 1 took 20 ₹ another 50₹ and last told 30₹ and iwant my money back otherwise i will case on airtel as well as on ekta communication in high court