2000 BMW 325CI Electrical System Problems

Dash started smoking as soon as I turned rhe lights on, I exited the freeway and pulled into a neighborhood, parked on a corner turn the engine off and disconnected the battery, the smoke continued, within second the fire started, I poured 4 bottles of water with no luck, before I could ask the homes residents to hand me the garden hose, the fire spread, the sprayed and it just kept coming back, fire dept, cut the dash with an are and sprayed it, finally it was out

I took my vehicle to a BMW authorized service dealer for the repair of the "AirBag Recall" notice I received in the mail. The dealer did the recall repair and about a week later the light came back on and has remained on. After that happened my electric started acting up and also I was not able to get my convertible roof to go up or down ever again. I politely contacted the dealership, (and not wanting to bad mouth them) it apparently fell on deaf ears followed by what I felt was an accusation and insult on my ignorance of being an older woman and that it was impossible,that maybe I did something to it. I didn't want to issue a complaint because they ARE a reputable operation plus I'm retired, on limited income and didn't know how to get this resolved. I welcome any help you may want...