I am not convinced that ‘figuring out who to call’ is the way forward. The IT people who can sort this are not likely to respond to an undergraduate. I agree it is wonderful if they do!
If DS thinks he can stay composed on the phone and replace some of those emails with phone calls, that’s great. But aside from the SPO, many on my list will be WFH or spend their time in meetings, so not reachable by phone. Long messages explaining this unusual problem are not a good idea!
Also he won’t have records and if this does need to be escalated to the OfS he will need records.
I know this may be difficult for him, but he csn and must start revising without knowing the timetable. Can you help with that, OP?
I am not sure that not knowing his exam dates will count as an EC, if one is needed. However as long as he isn’t giving people longer than 48 hrs to reply to their emails (or whatever uni policy says - that is typical) he is proceeding in a timely manner to resolve the problem and cannot be criticised.
The mess over his marks will defo count as an EC of the first order if it isn’t resolved soon.
DS should immediately screenshot a copy of his marks with the old marks that were replaced by the resit marks. He and you should keep copies of the screenshots away from his uni account.. Because if and when the problem is fixed, this will be the only evidence that it happened.
Is DS signed up with the Office for Students with Disabilities or similar? This is not the same as simply having DLA. They can be fantastic advocates for ND students during EC panel meetings. They will understand how badly this is affecting him. If he isn’t signed up yet, this might be the time. He can check online to see if they ate open over the summer.