Given an ultimatum.

I received my provisional offer back in August of 2023 and finally received a start date today. The start date is in less than a week. I communicated that this isn’t suitable due to the extremely short notice and I’ve been told to either take it or withdraw my application entirely. Is there anything that can be done here? I am a disabled person looking for work and was extremely hopeful I’d finally found a career where I would be accommodated for within CS. I feel completely defeated and distraught.

update: I just want to thank everyone who has taken the time to reach out and respond to this post, and to everyone for being so kind and empathetic. I hope none of my questions or comments seem silly, I’ve just been so upset over this as I’ve been looking forward to it for months and this would’ve been the first big step towards me getting my life back on track since becoming sick/disabled. Anyway, thanks to these comments I was able to find an email for the complaints team who I have escalated this issue to, but I still welcome and appreciate any other advice to help me get this sorted as quickly as possible! This really is a fantastic community.