Doesn't let me provide income details

I've been trying all day yesterday and just now this morning and it's still bringing up the message that I need to use the old system, and it's not letting me do anything. I'd like to get this completed and done, I don't want my son's application held up any longer than it has to be. What do I do now?, as it's obviously not going to let me complete this online.

Yes it's for a September 25 start. I'll do that, thank you. Can it be uploaded to either his or mine?

I eventually managed to get through and spoke to someone. She advised me, as you have on here, that there is a problem with the system and this should be sorted within 24 hours. I did tell her that I have been told for the last 3 days the same thing and it still isn't sorted. She said I should wait 24 hours until Friday evening and then check again. I'm a bit concerned that as it keeps telling me that I started the application on the old system, therefore I need to complete it on the old system, that is never going to get sorted as 24 hours keeps coming and going! So, I have uploaded the completed PFF2 form via my account. My question now is how do I know that it's been received, completed correctly or being dealt with as there is nothing in my account which shows I have even sent it. I don't want to presume it's being dealt with to then find out it isn't.
Additionally, is there no way I can do this through my account? The account is showing as action needing to be done - but I can't do it as it just takes me to the old system message. There has to be a reason why it's telling me I'm on the old system - is there no way of me accessing that (like it tells me to), so I can complete it on there? What happens next year when my son puts in for SF again?
I never thought it would be this difficult!!