United messed up my mileage balance. I was supposed to have 40K but the mileage balance showed 65K. I booked an award ticket for 65K. Now when I look at my statement, it shows I have a negative 25K. My mileage balance still shows a few hundred. I suspect the problem is that when i got my last 25K for a cc sign up bonus, somone or something double credited it. What should I do? I think UA should give me a one time credit since it was NOT my mistake.