> blaming them for not accepting email is kind of silly.

I definitely agree - but if the organization creates pain as an externality, then there's no incentive for them to change. Making them realize the cost of their decisions seems appropriate and just and not-even-abusive. Yelling at the person on the phone is bad and doesn't help anyone. Malicious compliance like this helps motivate them to escalate their concerns to people who can change the policy.