Twitter too in some ways. Publicly say something negative about the company and if they have a reasonable support team you'll be helped instantly. Tmobile is really good about this, as is Delta and Chase. Also surprisingly enough got some good support from California DMV over twitter. Who would have guessed!
In a recent hellointernet episode, they talked about how companies have essentially trained them to do just that. If you have enough public clout it seems to be the easiest way to get a response.
I once said 'freedom of information' on a call with my bank, and magically all the insurmountable problems went away and I got a call back (a real call back!) within minutes.
Simply stating that you are considering contacting your attorney will ring the same alarm bell a little more reliably. A bank employee might not know - but should know - that literally nothing the bank handles is subject to FOIA, but they're trained to treat a threat of litigation seriously.
Yeah the funny thing is I was actually idly talking to myself while the person was busy typing something - 'Does FOI work with private organisations? Oh no of course not' then all hell broke loose on the other end.