Brake light message Red

[cchino623]

I'm new here so hello everyone. This is my situation - i took my 03 x5 into a certified Bmw service department for an oil change which ended up costing me about 270 with tax. wasnt sure if that was too much but i did it because my X neeeded the oil change. At the end of the day i picked my X up and parked at home. The following day i noticed the BRAKE light red and an error message that read " check brake lining". Right away i thought maybe the mechanic screwed up my brake lining or something. Called them and the said to bring the X in so they can check her out. Now they are telling me that their error was a lack of communication from mechanic to representative and they should have told me about my break pads being at the minimum thickness. and that they will have to change my pads, rotors, sensor and other stuff for $1200. Any suggestions on whether or not i should take it else where or how do i find out if it was their error and not just a coincidence and does the BRAKE light go straight to red or does it turn yellow first normally?