You should still be able to access your car with a physical key, even if the car's battery is completely drained. Once you're inside, there's usually a manual way to open the charging port door.
If something's not working quite right, a warning light will usually pop up on the dashboard or your mechanic can use a special tool to check it out. In this case, it might just be a sensor calibration issue that can be easily fixed.
I switched to Go for their combined car and house charging plan. It's pretty cool,they adjust prices based on things like wind power and energy generation, which gives me some flexibility. This worked out great for me since I also use solar and need to top up my batteries during darker months...