I have been with a major domain registration company for many years. I have over 30 domain names registered and a SSL certificate registered with them, plus I tend to register a few new domains every year for clients.
Every year when I go to renew the SSL cert, they always require a copy of our Articles of Incorporation. So every year I upload it. Not a new scan, mind you, but the exact same file that I scanned years ago and have been sending to them every year since. In other words, they are not getting any new information each year, yet they keep asking for it.
This past year, we changed our phone number. (The service from the VoIP company we were using made it completely unusable. We couldn't transfer the number, so just got a new number.) Since it's a new number from what was associated with the cert last year, I can understand they need a verification process- fair enough. It's not a traditional phone company, so no bill exists with it and the company address. But the registration company will accept a letter attesting to the company address/phone number from (quoted from their site) "an attorney, accountant, or Notary Public." So we had our accountant, who has done our taxes for over 10 years and is an Enrolled Agent (an EA is registered by the IRS to prepare taxes and represent clients before the IRS), write the letter and submitted it. They refused to accept it because she is not a CPA. (Not that there is anything on their site that says the accountant must be a CPA...) When I called them on it, they said that in Califronia, the accountant has to be registered with the state board. (Again, not that all accountants who register in the state are CPAs...)
So just to clarify:
They refuse to accept a letter from an EA, who is registered with the FEDERAL government and has done business with us for over a decade (and has known me personally for several decades longer than that).
But they WILL accept a letter from someone who has never done business with me, just because they are registered with a STATE agency.
Needless to say, I am in the process of moving all my business to a new registrar.