You can get a new strap. If it was the black plastic that broke, they can still send you a new one. I know someone whose daughters plastic broke soon after getting them and she contacted crocs and they said that they would replace it for free because those are the most breakable part of the shoe. You can go on the website and find it, or email them and ask.
Thanks!! Yes, it was the black plastic part that broke. I will have to go to the website. Thanks again for the help!!