I think PIE's action (terminated Intercage's bandwidth) was completely appropriate.
Always try to keep away from bad guys. You might want to google the company name
before they sign a contract and if they are a spammer, do not have them sign it even if
they say they would pay 100 million dollars a month.
Intercage is a very infamous company as a spammer btw.
What Spamhaus did was simply excess.
They should have tried to find out exact IP's assigned to a spammer instead of blocking /22.
And at least they should have contacted PIE before they do that,
but they didn't do that at all, maybe because of their laziness?
They should understand that blocking /22 would have a very bad effect
on other innocent customers and innocent providers such as PIE.