If you submitted Form 60 instead of PAN earlier, Income tax dept now wants you to get a PAN
Form 60 is required to be submitted in lieu of PAN if an individual does not have one but is conducting certain specific transactions like purchasing a car, etc. However income tax department will send an individual an SMS and email about updating one's PAN number to the reporting entity where Form 60 was given or apply for a PAN.
Source: indiatimes.com