Have a "draw" problem on the motor battery in a 20...

Have a "draw" problem on the motor battery in a 2006 van. Was told at the end of the first day, it could cost 3-4 hundred dollars to find the problem. Of course the assumption was that after the problem was found it could/would be fixed. After two days, I was told that there were two problems, from the radio and the panel. The suggestion was to get a battery shut off device. I asked that the radio be disconnected as to decrease that draw. When I arrived for the vehicle, I said I had found a battery shut off device, could they install it? "No." Then I asked for more details about the problem, asked why they could not fix it.fix.fix.wrtaksomething,you cannot fix and then charge for the diagnostics. The diagnostics and t