

So sorry you are going through all this - take a day or two to recover from the shock, before making any decisions. That's what I think anyway - I always need a few days to recover from a big negative discovery or event.
I would keep your cable for now, because you are using it. If you have a smart TV or a laptop you can connect to your TV with an HDMI cable, you can usually get a few free weeks of Netflix or Prime to see if you like the content. There are a TON of movies and TV series on Netflix. We mostly watch TV series so I'm not sure how their selection of movies is.
But I don't think now is the time to get rid of any of the things that are giving you some comfort.
I really don't think it's fair of your Mom to say she will cover you, and then change her mind after you signed your lease. Can she at least cover you for a few months?
In any case it sounds like having a roommate is a good idea long-term so you can pay down debt and save. So finding a good, reliable person and taking time to verify they work where they say they do and that they have references is worthwhile. A good long-term roommate is a valuable thing.
I have fingers and toes on both sides crossed for you to have some good luck soon!