Microwave oven

Whirlpool microwave oven worked for 3 months and then stopped working called for someone to come and look at the microwave after a WEEK someone came out and said it needed a new part so we said alright and he went away. TWO WEEKS later I phoned up Whirlpool to see what was happening and they said they do not hold parts in South Africa they have to order them from Europe which will take around four weeks to come so after FIVE weeks the engineer came back out to fit the part but it was the wrong part they had ordered and he went away to see what he could do so after another week I phoned Whirlpool again and they said because it was taking so long for the part they would replace the microwave so I said fine another week passed and I phoned again they said they have no stock of the microwave oven and if the retailer has not got one then it would be middle to the end of November at least before they had new stock I talked to the manger at Whirlpool and he said he would look at getting a new one delivered which I hope will come at the end week. How can a would wide company not have parts in a country and the after sales is so poor no help or feed back.