Airtel — SIM SWAP OverCharged

I change my sim as I lost my phone . Airtel retailer near my home told me to take new sim.He charged me Rs 150 rupees which was supposed to be only 50 rupees.
I asked them that only 50 Rs are charged in alternate Number.

He politely told me that distributers have there own cut in this.later I visited the local Airtel Store in SHAHPUR muzafaarnagar and asked the same thing ...He also replied the charge for sim change is 150..