They are back in Court because you are not engaging, Banks don't go away, they may lie dormant but there is still over €2 million owing and there might be assets available that have over time increased in value.
The Bank stand behind other previously registered charges, they cannot force a sale as holder of a second charge, in practical terms there may not be enough left after first charge holder and costs paid off.
They can seek well charging orders against any property unencumbered that you own, they can force a sale on these.
They can register judgments against any property you jointly own.