Has anyone used the "hold your ticket for 2 years" option?

I was due to fly to SYD in Jan 21, which will not be going ahead, so I called the Qatar London office to ask about holding onto my ticket for 2 years, he went through it all and it seemed like a good idea so I went ahead with it, I can now fly anytime before 02/22 as long as there are seats available on the flight I want to go on.

What is concerning me is that I have nothing in writing, I asked the agent for a confirmation email, stating what we had spoken about, he said they don't do this.
my original booking has gone from the app and Qatar's website.

Has anyone else come across this? I am sure Qatar will honour my booking, but it's just a bit unsettling that I have nothing in writing.