Foxholer
Blackballed
I would suggest going vocal on twitter. I did with an issue we were having with Debenhams. They hated it and I had VIP service from then on. By passed their normal customer service and was dealt with directly by head office. Worth a go and if nothing else it may be cathartic. I don't like Ecco shoes so never going to be an issue for me
It appears that OP actually went through the traditional channels and, supposedly, got to the top H/O guy in their Tech area - who was the one that rejected the claim.
The advantage of going the Twitter route is that the Sales & Marketing guys are very focused on any bad publicity - the old 20:1 rule - and should react very quickly, hopefully over-ruling the Tech guy. Shouldn't need to happen that way, but seems to.
D4S is probably right that all fine until something goes wrong. Not my idea of Customer Service, even if that shoe does look a tad more than half a dozen rounds old.