When the body shops were quoting you 2k did they mention if there was any damage beyond the door. Either rates are extreme where you live or damage is more than just the door. All the average body shop would do is get a used door, install it, and try to match the paint usually. You should be able to find a door pretty cheap yourself. They are on ebay occasionally and think the last one I saw up did not even get a ten dollar bid. If the dent did not break the door glass any shop might use a stretcher and pull the door skin back. if you just pop the dent it will not be stable usually if pretty big on a door as the perimeter frame may have pulled in a little. You could get a decent compressor,spray gun plus paint,and used door for under two grand and have the equipment for free so to speak. Plus money in your pocket. Now if the surrounding frame areas of the door are moved this is a different story. Most adjusters are pretty tight and two grand seems more than they would normally pay for only the work you are mentioning. Perhaps the adjuster just had an unusual day or was seriously ill.