Hello Guys,
My heart goes out to you. The only cheap fix to this is to go to ebay and buy an arts and craft airbrush kit along with a propellant can. Total cost should be around £20. Buy some sand paper various grades and a touch up kit NOT the pen but liquids in a container. Primer, your colour coded paint and laquer.
Using appropriate grade of sand paper, follow the key pattern and sand it down flat. Then finer grade sand paper and smooth it. Once done if metal is exposed use the airbrush and apply primer to the area. Thin coats, wait for it to dry. Then using airbrush apply the paint. After about an hour (depending on paint) laquer the area using the airbrush. Wait 24 hours the polish and wax.
Should do the trick. I've used this technique on scatches that went down to primer level and the finished result was just as taking it to the body shop.
How this helps. I know it won't catch the culprits though