The debt continues to build (rent).
SISU had no intention of paying.
This is spot on!
SISU are hard nosed businessmen. They have seen a way not to pay the rent and scare the wits out of ACL that to try and force their hand would be a complete waste of further money.
Add to that the threat to move the main source of ACL income and they have moved the goalposts such that it is, potentially, ACL that have the financial problems.
If you admire hard nosed b'stards SISU are right up there!