Honda Civic Vti 2009 model making whistle sound?

I have Honda civic vti 2009 model and its 5 years old (79 KM running). After my 70K servicing it started making a whistle sound as soon as I start the car and sound increases as I push the gas paddle. Went to the same service centre where I had my car serviced and after 4 visits their answer is that they can't diagnose as this could be outcome of few different reasons. Spent $500 for last service and thats ended up living with this very annoying sound. Wondering if anyone else has the same issue or know anything about.

A very frustrated driver.

We'll check the brakes and it could be a belt

Thanks a lot for your reply.

Well, I guess forgot to add one important bit in my post that the noise starts as soon as I turn on engine and car is still stationery. This morning my mechanic spent 10 minutes try to analyse while asking me to keep pressing the gas paddle but couldn't figure out for his life.

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