Hi,
We don't know what the version of your preassembled Office 2013 in the new laptop. It might be a trial, OEM version and so on (Different version has different business policy). Thus, I recommend you connect your laptop provider to confirm how to regain Office 2013.
Or we also can give a call to Microsoft customer service center(https://support.microsoft.com/en-in/gp/customer-service-phone-numbers/en-us?wa=wsignin1.0). PS: If you call the automated telephone service, do not respond to the automated prompts, and your call will be connected to an operator who can assist you.
Regards,
George ZhaoTechNet Community Support