3d designers in london

Information for the business: private project
Design details: i have an already designed 3d model in design, however on submitting it to teh model makers, they came back and said that its 3mm long rather than 300mm

So basically i need it scaled up.

Apparently this isnt that testing, however my designer is now on holiday for the next 2 weeks and cant put this problem straight,
Ideas for the visual style: its all included
Preferred colors: red, white, pink,
Extra notes: i have a cad 3d design, however it is apparently the wrong size so as it stands its 3mm long, it needs to be scaled up exactly how it is designed up to 300mm