Bait & Switch?

Got my confirmation from the limo/taxi company.  I was quoted $69 each way, but its actually $138.  I said I wanted just a car, but going to the airport they've got us down for a stretch.  So I call them to cancel since they obviously can't get it right and there's plenty of other companies to use.  The girl says I have to call back on Monday and talk to her manager because once a stretch is confirmed it can't be cancelled, or at the very least they charge you for it anyway??  WTF!!  I didn't ask for a flipping stretch limo.  I'll get it straightened out on Monday.  I'll call from work and use my legal leverage.  Definitely not using that company.