URGENT: Which consulate to attend interview

[sallu]

Hi Guys,

I have a serious problem is knowing which consulate do i need to go for my H1B visa interview.

I am staying and working in Mumbai for past 3 years, but in my visa petition(I-797) my consulate is mentioned as CHENNAI. Given the scenario where i should go for interview is it Mumbai or is it chennai.

An early response will be really appreciated.

Thanks,
Sallu