All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad (
) is His slave and Messenger.
It is permissible to assist companies whose core business activities are lawful in repaying the principal amount of their debts, without the usurious (interest-based) increases, subject to the condition mentioned in the question.
As for the usurious increases, the basic ruling is that it is prohibited to pay them or to assist in paying them. Allah the Almighty Says (what means): {And if you repent, then you may have your principal – neither wronging nor being wronged} [Quran 2:279]
However, if the company is compelled to pay the usurious increase and has no way to avoid paying it, then it is permitted to pay it as a concession, in consideration of necessity.
Allah Knows best.