WESTERN DENTAL Horrible root canal that still isnt complete. Face was swollen and in severe pain for two weeks Roseville, California

I went to Western Dental to get a root canal and waited for almost two hours past my scheduled appointment in severe pain before they even saw me. The dentist then started my root canal and realized after "cleaning out the infection" that he did not have the correct supplies to finish my root canal that day.
The dentist put a cheap filling in the hole and scheduled me to come back without even giving me a temporary crown. Over the next two days I had severe migraines and my face was swollen where he had worked on it. He kept precribing me pain killers and antibiotics but it wasn't helping at all so I scheduled an emergency appointment and went back in.
I requested a different dentist to look at me this time and he discovered that the filling was not filed down at all so it was higher than the rest of my teeth causing my teeth to hit it constantly while eating or talking creating even more pain.
The pain lasted about another week then after 3 different prescriptions of pain killers and 3 different prescriptions of antibiotics I finally am starting to feel better but it is still a little hard to eat or brush my teeth on that side.
I still haven't gone back in to get it finished because they told me to wait until the pain is gone before they finish it. I owe them over $3000 for this and I lost 20 hours of work from the severe pain it caused me.
I have been there four times now for this one root canal and it still isn't complete. I don't want to go back in for my appointment or put anymore money into this but have no choice because this is the only place I can make payments.