Why did my refund for walking boots come unstuck?

The boots only lasted about 250 miles – and the store’s excuse was a step too farI bought a pair of Asolo walking boots in December 2015 from Ellis Brigham in Covent Garden. I wore them three to four times a year for about 250 miles. In August 2017 the sole on one of the boots came unstuck. The store sent them back to Asolo which stuck them down as a repair job. But in May this year, the soles on both boots came unstuck. To my mind they are not fit for purpose, but Ellis Brigham is r