agree with Mr. Vijay now you need the written proof.
In VAT audit section of VAT Act it is clearly mentiined that Audit report should be signed by Accountant and accountant mean a Chartered Accountant within the meaning of the Chartered Accountant Act1949 (Act No 38 of 1949).
Now As per Act no 38 of 1949:
Chapter 1- Piont 2 (1)(b) "Chartered accountant means a person who is the member of the institute"
Point 2 (2) "A member of the Institute shall be deemed “to be in practiceâ€, when individually or in partnership with chartered accountants in practice, he, in consideration of remuneration received"
Hopw your query resolve if you need the Act no 38 of 1949 then please let me know will send to u.