gas gauge not reading and tank won't fill completely

I attempted to fill up my 2006 several days ago and the fuel nozzle clicked off even though I had only put in a little more than half the number of gallons that it would normally take to fill. Even when I attempted to put in more, the pump nozzle kept clicking off and would not allow me to add any more gas. And then the gas gauge indication would not go up after I started the car. It stayed at 1 bar as if the tank was nearly empty and has stayed that way ever since.

I attempted the fuel gauge recalibration procedure detailed in the thread https://priuschat.com/threads/fuel-gauge-calibration-instructions.15063/ . I did it multiple times over a 2-day period, getting the 6-to-5 numbers as the instructions indicated, but the gauge still will not work.

I had replaced both the traction battery and 12v battery this year after one, then the other, failed. But the latest replacement, the 12v battery, was done a couple of months ago and the gas gauge was working fine up until now.

Any advice would be greatly appreciated.