Hello Jennie,
Thank you for posting your question on the Microsoft Windows Forum!
I'm sorry to hear about the experience you've had. If you have a Surface for Business device with an active extended warranty, and the Engage Center is not working, the Microsoft Q&A forum unfortunately cannot create or manage hardware replacement requests directly.
Step 1: Verify the Warranty Status
Please sign in and check the device warranty here:
https://account.microsoft.com/devices
If the device appears in your account, select the device and choose:
Service & Repair
to create a replacement or repair request.
Step 2: Submit a Service Order Online
Create a support ticket under:
https://support.microsoft.com/home/contact
https://support.microsoft.com/contactus#!
Search for the Surface-related issue, ignore the suggested prompt response, and select "Ask Our Support Assistant" instead.
Choose Product
Choose your preferred contact method:
A Microsoft Support Engineer will follow up with you to provide further assistance with your Surface product or related service request.
My Recommendation
Given that this is a business warranty and hardware replacement issue, I would not spend more time troubleshooting the device itself until you can reach the appropriate support channel. The priority is getting the warranty case created and the replacement process started.
I hope this answer has brought you useful information. If so, please click on "Accept Answer" and consider upvoting it. Doing so helps other community members identify useful solutions to similar issues.
Best,
Maurice