I've been trading on Coinbase about 4 years. I sent a Litecoin back in April as a test before sending the rest, and it's still pending on the Coinbase end after 4 months. After several support tickets, and trying to call I gave up on them entirely. It shows up with over 60 thousand confirmations, and they just completely ignore me. I'm not the only one that's had this happen in recent months. They have quickly turned into the worst exchange available. I'd heavily advise against trading with them. If you have an account with them, move it somewhere else, or offline.
This is really bad op. Could you post transactions I'd for all of us to see and find any solution to it. Then I would suggest you to find through the service section there's a guy who gets confirmations done very quickly and he was doing it for free, if that could help your case. I also had a account with them, but with Aug 1st event looming ans reading tales of before, I decided to move out of it. However when I had account with them, I had no problems as such. Did you tweet them to? I hope your issue is resolved soon.