http://www.dot.gov.in/contact-us

Dear sir, I have gone to pay the Bsnl bill yesterday at yadgiri which is in Karnataka state...my total bill is of amount Rs.938. The officers is not accepting the old 500 notes. Even though we have orders from central government to take old notes. They are not.I have made a mail to
gmglb_ktk[at]bsnl[dot]co[dot]in.b it didn't Get any respons from them.kindly do the needful