I've had this conversation with (dutch) government employees a good number of times long ago.
I use to wait with filling out a form until the absolute latest moment. I knew they [often] couldn't process the forms until they had all of them. I would get reminders and sometimes a phone call.
I explain my sabotage: If you already have access to these numbers. Why are you asking me for it? If it is up to me I will exercise my right to make a mess of it.
Same for paying taxes: You present it like I have a choice I can pay it or I can not pay it? But if I don't pay it you will give me a 5 euro fine and then a 50 euro fine and then the 800 euro fine and then you take the money out of my account or seize my income. So they choices are: 1) PAY or 2) PAY. Just take it out of my account? Why would you invite millions of people to make a mess from your administration?
I give the employee an example. I can request a form, it is send to my house, at the top of the form it asks for my name and address. As if I have nothing better to do? Then I return the form and someone has to check my name and address???? As if they too have nothing better to do. Multiply the effort by many millions and by dozens of forms and it becomes a horrific waste of of time.
Why are we doing this?
Now it is just a web page that shows the data they have on me. I click accept, even if it is slightly inaccurate and I'm done. Wonderful!