DIN 1 can be digitally signed by any one of the below:
1. CA in whole time practise
2. CS in whole time practise
3. CWA in whole time practise
4. Secretary (who is member of ICSI) of the company where you intend to be appointed as director.
If you get the sign of any person mentioned in 1 to 3, the attached supporting documents should be self attested by you. In that case, it would be immediately approved by the system online.
If you get the sign of person mentioned in 4, the supporting documents attached shall be either self attested by the applicant or duly attested by either Public Notary or a Gazette Officer of a Government.In that case, the MCA DIN cell will examine the form and the same shall be disposed of within one or two days.
You can contact any of the person mentioned in 1 to 4 and get their digital signature. The fees charged by professionals vary from case to case. If you are from Kolkata, I can suggest you someone.