You're also more likely to go see the sequel, to see it multiple times, and to see other Catherine Zeta Jones movies. In other words, they have something, an admittedly small something, to gain by pleasing the customer. You're the customer. So don't buy that nonsense that Jerry Maguire exists in Hollywood. They're the sharklings.
Production offices are much easier to deal with.
They're busy and harried but significantly more cooperative. If you are a Free-Market. Happens every day. There is, however, one thing you can do. Make your letter official.