I had an issue with about 80 plus another 60 or so BTC over the holiday too (not like your issue). Still mostly unresolved. I got a quick email but then nothing. For the moment I am forced to assume it is poor planning and woefully inadequate customer support over the holiday period. However, I wasn't a fan of the "victim of our own success" when Gox used it, and I don't like seeing the same thing out of Coinbase. Sadly, the market cannot yet punish their behavior, so here we are. I perform Coinbase-like services among many things for my clients, but I am not a SaaS platform, and I only do medium to large transactions unless for an established client. I have thought many times of developing my system into something more proper and autonomous. Maybe it they don't get their shit together...
In the meantime, being visible and obnoxious on r/Coinbase seems to get responses, at least at first, Then move on to r/Bitcoin if that doesn't help. FWIW, I tried both those things and they're still silent. I don't know if that is because I threatened to visit Steve Stockman (who is a tennis buddy) and shut them down before litigating them into oblivion, or if that is their practice with everyone. I let the amounts involved make me see red, since I had been predicting a surge on the 2nd, and again the 6th, and those coins were bought between $650 and $725, and there are only a few times where the perfect storm of multiple non-banking holidays and weekends stack up together with good news like this, to make such a clear case for a spike and then correction. Without question, CB cost my business between $25,000 and $35,000 through their incompetence and poor business practices.
So, I was pretty irritated. You may catch more flies with honey. Good luck and keep us posted. There I guess is always the possibility that they've made some poor choices and are floundering financially. $25M in funding sounds like a lot, but I've run the numbers to see if I could make a competing service. It is not that much when you have the size of their customer base and their business model. If somebody screwed the pooch just two or three times, they could be in trouble.
I hope they just sort it out. We let these companies get away with murder, because the community is so libertarian that we all feel subconsciously that it is an admission of a flaw to seek corrective action via state channels. Also, if time is money, I have no intention of giving them massive amounts more of both.