Vantage Auto Movers Lied, and deceived me with a fake document, which is a scam, and should be considered as as fraud. Boca Raton Florida

I contacted Vantage Auto Movers to tansport my car from Houston, Texas to Newark, NJ. The agent I spoke to was a man by Danny. We agreed on $400 final price. According to this individual, I have to pay $80 with my credit, and balance the driver $320, I signed the document he sent stating the same thing, but I was totally shocked when the driver brought my car to New Jersey. The driver came with an entirely new contract different from what I have, and the price I have to pay was no long $320 rather $390. I contacted Danny and he told me that yes, the prices might change, mind you, I have already sign a document stating how much to pay, why will it change without contacting me? Why will a documentated contract change without my signature? That is a fraud, and a scam. I know the money is not much, but already the case is with a group of laywers my family contacted because its a scam, and a rip off. I researched them online, and I found out I was not the only victim they have done this.