Eastern Railway — duplicate pan card

Address:

48 KABI SUKANTA SARANI, FLAT NO.-7, SHIVAM APARTMENT, 2ND FLOOR, KOLKATA-700085, Kolkata, West Bengal, 700085

I have applied for duplicate pan card and paid rs 499. The hard copy of application mailed by registered post one week back.
Now they are insisting to produce madhyamik mark sheet for date of birth verification. Therevis no date of birth in mark sheet but available in admit card. Copy of both sent.
As a central govt officer working more than 30 years where date of birth and date of retirement is clearly stated in my payment slip.
The same is also attached.
But stiil they are not issuing duplicate pan.