[...]so just wait for their response it will take a while to get. Coinbase is such a big crypto trading platform so they will handle support tickets on a queue based as most platforms do so you don't blame for their late response you may have to consider these things before.
There really shouldn't be more than a day's queue during what is one of the quietest trading periods. If it's over 3 weeks now, how long will it be during the next frenzy? I honestly didn't realise their support was quite this bad.