Need urgent help regarding CAS

[Molten Gold]

Hi

Looking for someone experienced to help me with this.

So I'm doing my dissertation at the moment and this is my second and final attempt.

The dissertation is due in May.

Now the university first issued me a cas as my current visa expires on 20th Feb. Then one day later they withdrew it stating that I haven't been meeting my professor and that it looks like I can finish my dissertation from abroad so the current cas is withdrawn and I have to leave the country on the 20th and continue with my dissertation from abroad.

Can they legally do this? I've already told them my dissertation is UK centric and I'm meeting with my supervisor next week. But they don't seem ready to budge.

I really don't understand what the problem is. My dissertation is due in may, my dissertation is UK centric and my visa is currently valid.

What should/can I do?

Thanks.