Non-refundable deposit moving broker

The moving company hade sign for a Non-refundable deposit that was excessive, 50% of the 1st estimated moving fee ($1000) and an additional $500 when they reassessed the packing inventory 3 days before the scheduled move. Then, they grossly underestimated my packing needs despite the photos I sent of my inventory. When I signed the estimate agreement, I told them several times my packing needs and assumed that they would do their job and provide a close estimate of out needs. However, when the pickup driver arrived, he informed me that out inventory would require at least 1,400 cubic feet, not the 500 cubic feet they had listed on my inventory. Suddenly I need to either come up with an additional $3,300, or I am out my $1,500 deposit. They took advantage of a disabled vet who has been diagnosed with PTSD. Then they called me childish and had me playing phone tag for an entire morning before hanging up on me. Now I need to leave my stuff in storage, fly down at a later date to pick up.