Just keep on contacting them with a more precise and specific question. Give them like proof of your assets from the trading/deposit history and see if they will reply to that.
LOL. Coinbase is in it fro profit. Why would any one of them lurk here? They give a shit about crypto. Why you dont buy on Kraken? Kraken have a lot employees lurking on crypto subbredits and answer questions very fast.
But if the thing here is that kraken already halted XRP trading in the US so if he is based on that country, he can't trade XRP.