Airtel — aadhar linking

Address:

854301

Sir, i am a customer of airtel telecommunication and from last few days i m receiving msgs about link my phone no to aadhar..
I went to airtel office located on purnia (Police line road). But they denied to link my phone no to aadhar and give references of nearby retailer.
Retailer again asking a fee of rs. 20 i dont know why? I denied to gove resulting non linking of aadhar to my ph no.