Specsavers Canal Walk - Terrible after sales service

I bought a pair of Under Armour sunglasses at Spec savers Canal walk just more than a year ago. Very expensive frame. Now after just more than the gaurantee period of one year the ear piece has totally disintegrated on the one side. So much so that the inner wire has been exposed. I took the glasses to Specsavers Canal walk and asked them if they can just put a new ear piece on for me seeing that the glasses are just out of gaurantee. They just told me that is not possible and that I have to replace the whole frame with a new one and I have to make a R500 co-payment. This has now forced me to fix the frame with duct tape (this is a R3000 plus frame) They flatly refused to even investigate whether they can replace the ear piece for me. Terrible terrible after sales service...