PIP Enquiry telephone Call

Today I called the PIP Enquiry line. I was asked a number of security questions, which I answered. But two questions tripped me up;

1) What's the bank account number your PIP benefit is paid into?

I have no idea, since the only time I've ever received a PIP payment was in 2016 when my appeal succeeded and they had to pay a backdated payment to me. I've changed bank accounts several times since then,and my Motability payments go directly to Motability. This question was skipped, but I had to awnser additional questions.

2) what is the name of your GP's surgery, their address, and post code?

I told them the name of my GP surgery, and their address, but I had no idea what their postcode was. I was told that the 60+ minute call would end if I could not provide my GP's postcode. So I said I'd do an internet search. I tapped away and provided my GP's postcode.

I was told I'd passed security?????

UTTERLY DAFT QUESTIONS. Why can't they send me a text message like everybody else does, including other DWP enquiry telephone calls.