A recent revelation by the Unique Identification Authority of India ( UIDAI ) that it has blacklisted over 49,000 Aadhaar enrolment centre s since its inception for fleecing and overcharging enrollers is a matter of concern for those who are yet to obtain Aadhaar or need to make corrections.Given that Aadhaar has become a vital document, it is important for us to ensure that we do not fall prey to these unscrupulous elements. The ill intentions of 'enrolment officials' fleecing consumers also raises a huge security concern.Therefore, if you are visiting an enrolment centre to get your Aadhaar details corrected or are applying for a new one, you must keep the following things in mind.1. Currently, there is no fee to apply for a new Aadhaar card . It is clearly stated on the Aadhaar website that enrolment is free of cost. Hence, you don't have to pay anything at the enrolment centre.Reportedly most of these blacklisted centres have been charging between Rs 50 and Rs 200 for printing Aadhaar on a plastic card similar to a smart card. However, it must be noted that there is no such thing as a smart Aadhaar card. An Aadhaar letter or Aadhaar downloaded from the UIDAI website is sufficient, according to UIDAI press release.2. According to the UIDAI website, if you are visiting the enrolment centre for updating your name, demographic or biometric data, you have to pay Rs. 25 to the service provider each time you get your details updated. This fee is applicable if you visit the enrolment centre, not if you do it online. Understandably, for updating the biometric data, one has to pay a personal visit to the enrolment centre and a fee will be charged.Details like date of birth, name, address email, mobile number can be updated online. Since these services are authenticated via an OTP, linking mobile number to Aadhaar is must for updating your details online.3. Even if someone loses his Aadhaar card, he can download it free of cost from the UIDAI website: https://eaadhaar.uidai.gov.in.4. If you've mentioned your mobile number while filling out the Aadhaar application and it gets rejected, the same will be communicated by SMS. As per the UIDAI website, Aadhaar generation involves various quality checks, so there are chances that your Aadhaar can get rejected due to quality or other technical reasons.Therefore, if your Aadhaar application is rejected, it is recommended to re-enrol yourself.If you are suspicious of the activities carried out at an enrolment centre, for instance, if the officials are overcharging or if they are quoting a supposed revised fee or new UIDAI policies, here is how you can bring it to the notice of UIDAI.1. Write an email raising your concern to UIDAI at help@uidai.gov.in2. If you're unsure about the protocol or the applicable fee, call the UIDAI helpline on 1947.It is recommended to visit only authorised common service centers or permanent enrolment centres for Aadhaar related services. On the UIDAI website's homepage ( https://uidai.gov.in/ ), under Aadhaar online services, there's an option to "Locate Enrolment and Update Centres".This takes you to a new page where you are required to fill out details like state, city, district, and so on. After final submission, the list of enrolment centres and their status, i.e., permanent and camp-mode, will be displayed on your screen. Click here to find your nearest enrolment centre This takes you to a new page where you are required to fill out details like state, city, district, and so on. After final submission, the list of enrolment centres and their status will be displayed on your screen. Click here to find your nearest enrolment centre