2000 Honda Accord power steering pump

Thursday I took my car in to get an oil change, and they told me I needed to change my belts. So, they did both. When I picked up the car, I noticed a small leak under the front passenger bumper. When I pulled out, turning the wheel made a low whine that got louder and louder, whenever the wheel was turned in either direction. I thought it was because the belt was just replaced. 2 hours later, I called and said something was wrong, the noise hadn't stopped. I was told to bring it in in the morning and they would look at it. They told me it wasn't the belt, that it was the power steering pump and it needed to be replaced. They had tried putting the Honda PS fluid in, but it's still making the noise, and that it wasn't a safety issue. I said it wasn't having any problems before I brought it in. The manager said the lowest price he could find was $400 for the part, he would not charge labor and take $100 of the price to take care of me. I couln't wait for the part to come in, so I made an appt for Mon. When the tech brought it around for me, he said sorry I broke your car. I did put ps fluid in, but I don't know why the pump. That Fri. Night I noticed a smell when I got out of the car, and when I lifted the hood, there was fluid sprayed all over. If they had put too much fluid in, would that have broken the seals on the pump. Or a hose. Or did the pump just break and that's why it's spraying. I find it odd that everything was fine when I came in, then the pump's broken, there already was ps fluid leaking out in the parking lot before I left, that he didn't notice the noise when he put it in the parking lot, then he's taking $100 off the cost of the part. My ex-husband always took care of these things, and I don't know what I'm talking about and don't want to get taken advantage of. Is this something that just happens, and I get to pay $300 for a new pump, or does it sound like something they should replace? Thanks.