Appalling Service!

I bought a shoe less than a week ago, I wore it once as the purpose of buying it was surely not to store it. The shoe is highly uncomfortable to walk in, I literally had to take it off and drive barefoot till I got home. Took the shoe back to the store to return it with the slip and explained the situation concerning the shoe. The store refused to refund me as the shoe was worn. What is the purpose of buying a shoe??? Of course I was going to wear it, it's not an ornament. The logic and reasoning behind the people I dealt with was frustrating and there was absolutely no customer service rendered. They called a Chantel at their head office who advised it was at the store managers discretion to take the shoe...what nonsense is that? Is this not a national company that the decision can be upon an employee's discretion? Then I was told the shoe will go for analysis by their technicians to analyse it. Comfort is subjective people... no one could explain to me what checks are done with this analysis as I'm not complaining about a zip that's not working here or a torn leather but the shoe literally hurts the muscle between the sheen and your foot by your ankle as you walk in it. Whatever decision is taken by this "analysis" won't change that... so why must I wait before I get my R450??? The shoe won't all of the sudden be comfortable after that analysis. Why am I being inconvenienced? The incompetence on reasoning is beyond me here. For a company that brands itself as one of quality, a lot is lacking, quality in the shoe, quality in competence of employee's!