I've had nothing but trouble w/ them as well. Deposited over 50K in stock and they posted 2 15,000 credits to my UAL MP account. Two months later they subtracted 15,000 miles. I had to sell the stock and close the account and they not only subtracted another 15,000 from my account, they actually posted another -15,000 to my account.
I've argued w/ them numerous times and finally got someone sympathetic from MP customer servce to reinstate the 15,000 miles.
Is it legal that they can remove miles from an account once they have posted them? Anyway, I told one of the Etrade reps. that their attitude towards their customers is one of the reasons their stock is in the toilet recently.