My roommates agreed to help my puppy when then are home?

To start off, I’ve had my puppy for 2 weeks, she is 9 weeks old. My roommates agreed to help with taking her out and the basics when they are home, an in exchange, I offer extra tent. Not a lot, just an extra $100/month. My problem is like today for example: both my roommates (a couple) had off of work today. I knew one was busy for a portion of the day, so I asked the other to try and take the dog out every hour, just until she poops. Im sure he took her out once or twice today, but sure enough, when I got home from an already crappy 13h day, my dog, her brand new toys, her food bowl, and her crate are entirely covered in poop. This happening even 3 times a week wouldn’t be too much of a problem, but it’s every single day. For the health of my puppy, I cannot keep washing her every day, she is a shepherd husky mix. I am extremely frustrated and resorted to yelling at my puppy bc of this. I don’t know how to address this with them. She was crated all day I’m sure while they were home. I am getting a camera to watch her while I’m at work though. How should I confront my roommates?
My roommates agreed to help my puppy when then are home?
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