I paid to have my lawn mower fixed, both running and the mower belt put on.?

I paid $50 for him to take it home to work on it. He came with recommendations from a mutual friend. It's been a month, and he finally called and said he needed a part, which I had to order, and came in last Monday. I called and informed him, took it too him, and he said he needed $80 for work on it, as he'd installed a spindle on the mower. He brought it to the house, and asked for another $89. He assured me it'd run and work. All the gasoline had been drained out. It got to the house with a dangerous fuel line leak, which he told me what to buy and how to fix it, which I did before I started it. I made one pass around the lawn, and it isn't mowing correctly (the middle of the deck isn't cutting), and the belt seems so loose it won't turn now (possibly the spindles he supposedly replaced). I parked it, and called him, and went to move the mower inside and it wouldn't start. I'm furious! Now, it looks like he didn't replace the 2 spindles he said he did. Has he broken a theft law of any type because of fraud that could be prosecuted criminally, or is it simply a civil matter?