A lot of the problem with electronic forms of communication is the immediacy that it conjures in the callor... You can hear/read it in their tone. No friendly greeting, no personal introduction, no basic courtesy. It's just, I'm calling to extract something out of you, and don't you dare hang up on me! LOL... I had some re-subscribe call center agent call me months later about an online magazine subscription that failed 2 attempts to authorize my card. He assumed that it was a valid, ongoing sale (months later) and that I was still interested in their magazine after spending half an hour on their crappy checkout page months ago... He tried to goad me into paying, saying it was a contract, etc, yada yada... I hung up on him after he refused to take no for an answer... He then proceeded to rapidly autodial multiple callbacks until I remembered where the power button was. 😁 Thumb power!

If you can find a way to slow the raging river of calls and emails, it's a lot more palletable way to use electronic communication methods... I'm thinking of a phone number that only plays a voicemail telling the callor how to reach me through decentralized methods of communication like Nostr, SimpleX, DeltaChat, etc, etc... Onboarding as obfuscation... If they really want to communicate, they will, but most likely they'll just move on to their next victim... It's the politest yet productive "no" that I can think of.