Suing due to disability discrimination

Does anyone know how I'd go about this please? I know there's criteria, such as time limit, etc. which I'm well within.

In my case, (it has been mentioned on here before) I can't attend a college because they've denied me reasonable adjustments which have been recommended by 2 unis (and were followed by said unis) and a previous college followed the same recommendations.

They tried to justify their refusal by:

- deciding I don't have Autism (it's in writing that I have it)

- telling me I don't need those recommendations as recommended by 2 qualified disabled students allowance (DSA) providers

- telling me that I have equipment I can use which solves the issue. They don't solve the issue.

- telling me that people with severe physical disabilities don't get help (how is that legal?)

They claimed it was all down to money - that's their justification.

This has meant I'm going to have try and find somewhere much further away to continue my education, for which there really is nothing.