After IT check with apple customer service, they have not stock battery for changing . Thus it takes time for 2 weeks to deliver the new one for your replacement.
Please step as detail below;
1. Format and Back up you data
2. Take your iphone to check and wait feedback from apple customer service.
3. You can take your iphone to use normal after checking at customer service.
PS : Pls. kindly ask P.Jeab for available time for IT processing as above detail.