Aadhaar is absolutely optional and no body can force you to either enroll or link the same with any service whatsoever.
This is so even after the Aadhaar Act, 2016 that is of no legal significance as it violates the interim order of Constitution Bench of Supreme Court of India.
Further, the constitutionality of Aadhaar Act, 2016 itself is in doubt and Supreme Court would declare it unconstitutional very soon.
If you receive any demand for Aadhaar enrollment or linking by any bank, mobile company, PF office, ration shop, employment exchange, school, etc, simply refuse to comply with that illegal demand.
Just attach this Aadhaar refusal form (pdf) for refusing to enroll or link your Aadhaar with any service.
Send Form (a) By Hand (b) Send By Registered AD © Paste At Bank’s/Mobile Co’s Premise (d) Send By E-Mail (e) Share At Twitter
Source: Aadhaar Law.
Techno Legal Blogs Of Perry4Law Organisation 
Pingback: Aadhaar Project Is Unconstitutional And Supreme Court Must Scrap Aadhaar: Perry4Law Organisation (P4LO) | Online Resource Centre Of Perry4Law Organisation (P4LO)