Poor after service!!

I have over the years acquired many Swatch watches. Recently I wanted to replace a strap from a watch I bought about 18 months ago because the buckle broke. The swatch shop in Eastgate had no stock and said they would order one for me. This week I received a call from them, informing me that the Swatch head office doesn't stock this strap anymore and they would have to order one for me from Switzerland. They would then charge me the cost of the strap plus R150 for ordering it. This made me extremely angry. This is a relatively new watch and they already don't stock the strap anymore. This is also the second time this happened. In November 2014 I bought another watch at the same store. When the staff removed some of the strap to shorten it for my arm they damaged the strap. They said they would order a new strap for me. I waited for months and months for the new strap and in the end they just said sorry Swatch SA doesn't have the particular strap in stock and won't ever get it. I am extremely disgusted by die service from an international company. Why do they sell these watches when they don't stock replacement straps and they are unwilling to get the stock.