Hacker on mobile

This day I am almost cheated.
A man called on me claiming that his name
Vijaykumar manager of State Bank of India.
He added that as it is last day for registering
Akhtar no.with my bank a/c.I shall be at loss.
My ATM card will be invalid.He asked me first
to tell my adhaar no. I obliged immediately fea
ring invalidation of my ATM card.
Then he asked for ATM serial no.and replied
forthwith.Then he demanded my pincode
which is not valid from next day and he offered
to tell new PIN. I told him my PIN with out least
suspicion. Immediately he gave me.new 4 digit
PIN.
After sometime he rang me up tell that adhaar is
not matching  with my mobile no. At this stage
I  recalled the warning from SBI that they never
call for any information from customer.I understo
odd that I have been taken for ride by a hacker.
Thank God there is a mistake  in my adhaar so
it is not working. The fellow again called me to
tell that I have given him wrong information.
I replied I don't need any new ATM card as I
don't  have any transaction with the bank and
my balance in my a/c is bare minimum. Finally
the fellow asked if I have  a/c in any other bank.
I cut my mobile and there was no more calls.