Priceline complaint: Customer service

I am not very happy with my experience with you guys. I talked to a Layne and he basically said that he couldn’t do anything more then make me pay over a $100 more then what I found online. He would not honor the price they were selling the ticket for online. I feel like I will never book with priceline again. I am very disappointed in your customer service. I am a single mom just trying to get my son and mom on the same flight as me and my daughter and I paid almost the same price as I paid for a round trip ticket for 2 for just 2 one way tickets. How is that even possible? I paid 435 for 2 round trip tickets and then he told me i had to pay 405 for 2 one way tickets when i found them for almost 150 less then that! I hope you stop screwing people over and making them pay more then they should. If someone ask me how to book a flight I will tell them don’t book through priceline they are only out for money!!! I hope you guys make this right and refund me some of my money back abs adjust it for the price it said online!