Subscriber import errors

Jetpack used to be good but recently I’m having endless problems importing subscribers. I keep getting an email saying there’s a “snag” in the process. There isn’t a snag, there’s a huge bug. The support people always unblock it on the back end when asked, but it’s tedious to keep going through the same process. This is clearly a known error that is taking far too long to fix. I have a paid subscription and expect it to work better than this