interface landscape design and build

We hired this company to do landscape work in our front yard. We paid a deposit and they didn't start the work until the following year even though they said they would start within the month. The owner (Larry) is probably the most unresponsive person I have ever dealt with. He charged us extra for the warranty on plants. One of the trees died within a month and he refused to take our calls despite dozens of email and text messages. He also claims to know what he is doing when it comes to planting but he doesn't as we have had to redo our front because he planted the wrong things. STAY AWAY!