change of aadhar number
1) What is meant by change in Aadhar number. It never changes except for it's contents like address etc.
2) How you incorporated your aadhar in EPF before 2014 such KYC was not available that time, not even the UAN system. In case you have to incorporate a new aadhar in your non-aadhar EPF, it's easy and no employer interference is required. You can incorporate online in your portal and will be approved directly based on your aadhar data. Directives by EPFO staff is wrong most of the time.
3) In case you left the job in 2014 how you are continuing with your EPF which becomes inactive after 3 years of no deposit.
May be matter is not informed. Did you try to incorporate it in your UAN? It is possible that your account has already become in active so no modification.
Best option is to apply for withdrawal. Why you are not doing it.
As per the law post service EPF interest is taxable in any case. more