There's quit e bit in here to address.
Your first points of call are:
1) the ward manager or deputy ward manager
2) the placement PEF (practice education facilitator) team - every singe placement area has a team of these people, sometimes under a slightly different name, whose job it is to make sure that departments are supporting students properly in practice.
If you don't get appropriate support from these people, that's the point to go to the university.
You've just said exactly why mentors/practice assessors/supervisors aren't always able to fully support students.
I'm a registered nurse and a practice assessor, and an hour every shift looking at student paperwork is excessive. A discussion of "what would you like to achieve today" takes 5 minutes and logging in later to sign a few proficiencies takes 5 minutes (so 10 mins a shift); a midway or final review realistically usually only takes 30-40 mins to complete and that includes looking at proficiencies achieved and an episode of care.
Spending time over the course of the day teaching students things relevant to the ward (e.g. on my ward, doing complex dressings, admitting/discharging patients, taking drains out) is something that ought to be done on every single shift.
Absolutely not. If a student has filled sections in, we need to check it's correct before signing.
Yes, it should be escalated that students are being abandoned and documents not being completed. To the ward manager, then PEFs, then university as per my answer to your first point.
If you'd sent emails to the ward and spoken to the ward manager sooner, your documents would probably have been sorted earlier. They probably seemed unhappy because they could have helped you sort this, like they said to you!
You should inform the university that you have been having difficulty getting documents signed, yes.
What malpractice have you seen? You've only been complaining about having difficulty getting your practice assessor to sign your "epad" - that's certainly not malpractice.
You've already said it's a very busy, short staffed environment - I highly doubt that the manager, deputy manager and your PA/PS are going out of their way to ignore you. Your assessor already hasn't had time to sign things in 8 weeks - not through racism, but through lack of time.
The only "racist" thing you've said anyone has done is not sign your practice documents.
You can report it all you like... to the hospital/community setting, university, and the regulatory body.
No, you shouldn't have staff shouting at you like that. You also shouldn't be losing weight through stress of a placement, either.