Very Very BAD BAD SERVICE....They have no idea wha...

Very Very BAD BAD SERVICE....They have no idea what they are doing. Charged me $300 for less than 15 minutes for telling me what i told them. I told them i have high water bill and around this area(under the kitchen sink) i hear water gushing. Suppose to be plumber/technician told me I have possible high leak under the sink because he can hear water sound what i told him.