Central Locking system/interior lights not working
 

I purchased a used 2005 Audi TT Mk1 in October of 2017. On my way home from work two days ago the electrical system began acting up. After putting the car in the garage my alarm went off repeatedly. I was able to shut it off with one of my remotes, finding that one had a dead battery. Now my interior lights have quit working along with the central locking system. I have replace the fuses for both and nothing has changed. This s my principal means of transportation to work. Does anyone have an idea as to my next course of action? (Short of a dealership)