hello
i agree with the above. Normally the standard companies will follows some procedure.
- u need not get a fresh appontment letter.
-a letter informing to you that you have been promoted will suffice.
- as stated earlier standard companies will will give even the annula increment letter mentioning your designation and salary.
- in worst cases, you will get salary slip wherein the your salary and designation is mentioned.
- you might have signed some correspondance with individuals and other customers during the course of the businees, even this will also suffice
thanks
nagaraj

Retd GM - HR