Phil and Ian,
It's an easy job replacing a lense, I had one of mine out when I was seeing how easy or not easy it would be to fit it in the rain sensor cover. With the body of the camera placed behind the rear view mirror, but discounted the idea in the end.
I reckon you are both within your rights to it being sorted under warranty. Now if you ask for the camera's replacing, the sellers would most likely require you to send them back, and if thats China..................
They are more than likely to be happy sending you a replacement lense, little cost to them, less hassle and expense to you. Besides better than crap reviews being made regards their product and or service.
Keep us posted in regard to what you end up doing and how you get on.
Phil if your Mobius looks like Kurts photos of his in post #517 then you have the standard lense. If it differs in that the lense on yours has a collar about 5mm making it stick out past the body of the camera, then it's a wide angle lense.
For your info I have my wide angled Mobius, not set at the wide setting but at the standared setting. Though the standared setting on the wide angle lense is still wider then the Standard lense version, but not by very much. If you query why I set it up that way, read my later posts I posted on this thread last year.