Goeanaco you don't say whether it just failed without you doing anything or whether it was the result of a fall or banging it against something. If it has just failed under normal usage then it should be replaced under warranty. If caused by an accident then I would think not. I suggest either way that you go back to the retailer first. If both of those fail then check your household insurance policy - it may be covered by that.
It is the Garmin 22mm quickfit stainless steel band. JSRUNNER, I wear it at the office, i'm not really an athlete..I will contact Garmin, hopefully they offer a suitable solution