Questions about Time and Materials Contract

Except for purchasing my dream home recently which was a very different contract, I admittedly have zero experience with contracts. I recently hired a reputable contractor and feel like I was taken advantage of, I'm seeking help defining what I can do. Hired landscaper for several large projects; circle paver patio, water feature, steps, block paver retaining wall and irrigation system.

The estimate/contract (title on actual contract) lists each feature with very little information under each heading. example; Steps, 8 steps @$220.00/step, 16 hours labor @ $65.00/hour, Poly sand to fill space between steps $35/bag plus labor Total: $2,900

Each element was listed in the same manner as the steps example. I had never heard of a T&M contract, so I thought I was going to be charged the amount listed for each project. This is how I budgeted. I asked questions about price, hours and other aspects of what was being done constantly, each time I was treated badly and told I had no reason to question him. By doing so I was saying he wasn't worth what was being charged. Then when the project was completed (although 2 projects were left unfinished) I received another estimate/contract and all prices were increased to a point where some were tripled! Material prices increased and labor increased. Looking again at the example above, I asked about 16 hours of labor since I knew they were completed in 8 hours. The answer I received was "a friend came and helped" so he doubled the total hours worked! The poly-sand was not installed, so he ran a line through the item and deducted $100 (1 bag/1hour).

I'm trying to find out what a contractor's responsibilities are to their customers. Was T&M supposed to be explained? Can I ask for copies of invoices or receipts for materials? The contract was not dated and was never signed. I asked about signing the contract, but the answer I received was "Oh, I trust you." I completely understand I should have insisted on signing but didn't. OH! I with-held my final payment when irrigation drip system was not finished, and what was installed continually blew apart, in addition, a pipe to the water feature was broken flooding the yard, and only when I couldn't get the water to stop did I learn he plumbed the water feature into my home water (at the bathroom) and not with irrigation system. Now I received papers in the mail from an online company, this company is putting a lien on my home!

If anyone can help me I would greatly appreciate it! I simply don't know what I can do and/or what this company has to provide to me about work completed, and can't seem to find much online. THANKS so much!