How do I find The water line into my house?

If you have a pier and beam home you can sometimes look under the house and get an idea of where the main comes in, I can almost find it everytime on a pier and beam. On a concrete slab it can be more difficult due to landscaping installed over original shut off valve. Sometimes you can get a good idea from the city water meter location straight to the house, (sometime a hose bibb/water spigot will be close by.), but lines are not always straight from the meter. If the line is copper a plumber with a line locator can probably find it. When people don't fulfill what they are being paid to do, you should simply refuse payment due to incomplete work, I personally would not have given you a price without first seeing the property due to the sometimes difficulty of locating a line.