Isn't there a workaround where you can stop a pending transaction or sweep it into your account?
I just tried to send some bitcoin to my Bitpay account, and I have sent it there probably 50 times with no issues, and the invoice shows as paid right away, and it didn't happen this time, and its been a pending transaction on Coinbase for a while now.
The guys at Airbitz once mentioned a way to sweep the account for anything that was 'stuck' but I can't remember how now.