That's a damn shame... Two weeks after I bought my 1999 328is (new) someone put a ding about the size of a golf ball in drivers rear quarter. I too the car to a place called the dent wizard and they were able to remove about 75% of the ding - I would give them a 6 on a scale of when to 10. A few years later I found a similar ding on the passenger door - while at my local BMW dealer I asked if they knew of a place that could fix it - they use a place called dent magician, which goes to the dealer in fixes dings - long story short, after 20 and $60 I couldn't find the ding again - this place was amazing - he commented on the fix the dent wizard did and said that it was the technology back in 2000 - now they can repair just about anything anywhere.

Good luck..