Wow now I'm pissed. I had the same issue but didn't make a public stink about it. Just got my coins today with no credit for the mistake and the same issue of my coins being frozen at a higher price. Looks like I should have been more rude about it.
Not only that, but I was told that my coins could not be released earlier because "they needed to be removed from cold storage". So now we have 2 different excuses for failures in the same time period. The cold storage excuse seemed completely bogus to me too because we're talking about crediting a number to my account, not getting actual Bitcoins. They don't become Bitcoins till I send them out of Coinbase.