Faulty DLC coating on Tactix 7 pro

My Tactix 7 pro is 3 months old,not even worn every day during this time, and it looks like it is 3 YEARS old.The DLC coating has rubbed off all around the outer edge of the bezel.

i havent scratched it on anything.It just started to disappear, showing the bare titanium.

Customer support have dismissed my query acknowledging that this is NORMAL wear and tear.

Does this mean that the super dooper diamond dlc coating lasts a couple of months on a £1100 watch ?

Absolutely disgusted by garmin.And I am a customer of many years and owner of numerous garmin devices.