There were a bunch of trees on the perimeter of our property that needed to be removed, all less than 3" thick, plus two more trees that were about 6" thick. Derek said that he'd cut the trees, dispose of them and grind the stumps so that the remnants of the tree won't be visible above the ground. His team came to remove the trees, and most of the trees were removed except for some trees that were too close to the fence. He had warned me about that beforehand, saying that his chainsaw would ruin the fence and be dangerous to operate.
After I had paid him for his work and his team left, I noticed at the back of the property behind the shed, his team had left a few stumps ungrinded. So I called him to discuss why that was the case, and he said it was muddy and there were some stacked patio slabs in the way. He told me he would come in to remove those stumps when the weather was better and I had removed the slabs. So I gave him the benefit of the doubt. I removed those patio slabs and notified him that they were removed and the area was not muddy anymore in a voice message. I waited 3 days and no answer from him.
The end result is I had to buy a pick axe and rip out those stumps myself. That took about 1 hour of hacking; one of those stumps was 6" across!