Business ProfileforSeaTac Airport 24

I retained Seatac Airport 24 to shuttle me to the airport yesterday on 12/28. Beyond the driver being 45 minutes late (I confirmed the pick-up time the night before) and me barely making my flight (which meant my bag didn't make it onto my flight, and I've been waiting for it to be delivered today), I received a text literally on my way out the door that they were charging me $100 extra for the service (they had sent me an invoice the morning of the 28th confirming the $50 rate, and they now wanted me to pay $150). They sited snow as the reason, but it had been snowing for days, so at any point they could have contacted me to let me know they would need to charge me more, and I could have made an informed decision. It really felt like they waited until I had no other options and would be forced to pay extra or forfeit my ride and my flight. When I got into the van, I paid the driver the agreed upon amount plus tip (a total of $60) and when I refused to pay more, he yelled at me. I convinced him to take me to the airport, telling him I would be happy to talk to his boss and work things out at a later date. He agreed but proceeded to yell at me again when we arrived at the airport. It was a very upsetting and stressful morning. Since then, I received a receipt for the $60 asking me to pay another $100. When I wrote back refusing and including a complaint, I received another harassing and threatening email. I looked on Yelp and saw that others had had the same experience, so I wanted to log my complaint with BBB, hopefully warning others of this scam.