Trans United Van Lines Misquoted a move and refuse to deliver my belongings. Pacoima Ca California

Hired Trans United van lines to move me from Bradenton Florida to Vermont. Paid $350 down . They quoted me $1100 for the move. Picked up my belongings and demanded another $1100 because they said I used more space than agreed upon. Delivery date was set for May 14th. They never came and it's now July 11th and they still won't give me a delivery date. They give me every excuse but mostly that they don't have a driver. Went on their web page and there is not one good review. I contacted one lady and she went through the same exact thing they are putting me through. How can they keep doing this to people and still remain in business? I also put in a complaint through the US Dept of Transportation. Please help me as I'm so afraid I will not see my belongings again..