It's not about what's in the letter, it's about who sent it. When you personally request something it will get handled by their usual support people, but lette

It's not about what's in the letter, it's about who sent it. When you personally request something it will get handled by their usual support people, but letters from lawyers usually go straight to legal and get handled there. Legal saying "what we're doing may be problematic" is much more likely to cause change.