Potentially Fake Email with my Internet Receipt Number

I recently received an email from what appears to be a fake email account. 

The account is: DELL_UK_ONLINE_SUPPORT@Dell.com

There was no official looking branding and the display/layout of the email seemed like they were trying to be professional but had no idea how to actually replicate company emails. 

They claimed that my transaction couldn't go through because of a 'Credit card authentication failure', however they did not provide any details relating to my purchase or anything really. 

The only detail they had, which has worried me greatly, is my Internet Receipt Number. 

Has anyone had a similar issue like this? 

I cannot call dell support right now because I have no Mobile Service where I am. 

I purchased an XPS 15 yesterday and still waiting on my account page to update and order to finish 'Processing' I have not bee assigned an Order Number yet. 

Just wondering if anyone has experienced a similar issue.