App needs finishing

I have an app that needs finishing. It is technically done but the last developer has wasted my time in that it’s doesn’t work right. I need a team to come and help me get this app right within 1 week. The summer is here and it’s the most critical time of the year for my app. I need this in production within 10 days. It is in react-native and the details will follow. The app is completely written but Breaks easily. I need an experienced development team to finish within a few days. This is not a job to milk for months. So if that is what you want do not contact me. I need results