Here's the opinion of a user who's never had a moisture issue, for what it's worth:
1 - Call the toll free customer service number for your carrier. Be very polite and calm and explain the problem and what you've already done and who you've already talked to. See what happens.
2 - If you do have a moisture indicator that has turned, I think you are out of luck regardless.
3 - As MM says, there are numerous reports on the forum of moisture issues because of exposures as slight as a sweaty pocket or foggy locker room. Sometimes removing the battery and drying the device real good fixes things.
Maybe you got a faulty device and that one indicator is a coincidence. But, as I say, I think you don't have a case with that turned idicator.