Hi!
My supervisor decided to move to different university so I was left alone and my department did not worry to help me. They offered me the chance to apply for a new PhD (one year into this one). I laughed them off and spent 3 months looking for a new supervisor and lab that would take me in. Finally I found one. I am not sure whether that was the best option, as my new supervisor all the time tells me that this is not her expertise so she can't help me much (though the fundamentals are the same to what she does in her research and I'm no expert either). However, that was the only person that agreed to help me so I'm grateful. Overall, I feel like it is the university fault to give permission to some people to supervise, who obviously don't care about students!