Akshaya Centre — excess charged for aadhar data updation

An akshya center in kangarapadi, ernakulam charged rs. 50/- for adding phoneno in my aadhar card. They claims that it is an akshay center but no id in the receipt they given. I asked them whether the correct charge is 50 or not one or two times. But the person confirmed it is fifty rs itself. From the site i came to know that it is just 25 rupees for aadhar updation.
Please take the needy action