Defective CAT boot and no repair

My daughter traveled to the UK. We bought her a pair of CAT boots for the trip over winter. They lasted about six months and one zip broke. When she returned to SA I asked CAT if they would help me with repair. Initially great service. Sent a courier to pick them up and then... Total change in attitude. A sarcastic and snide Jaco Jordaan (so called brand manager) called me and claimed the boots were worn so they will not repair the boots. Blamed my daughter saying she did not use the zip \correctly". Apparently his idea of customer service is to blame the client and not seek to resolve the problem. All I wanted was to have the boots repaired"