Extremely poor customer care

I have a Siemens washing machine that required a change to one of the faulty parts. A technician evaluated the problem area and assured us that he will be back to replace the part and that it was a minor problem. Three weeks later and I am still waiting on the part to be replaced. Nobody ever contacted us to explain the delay. When we called twice, they said the new part was damaged as well and they needed to send it back to the supplier.. There was no formal apology for the long delay or any further explanation given, or even a confirmation of whether or not we would be home when they rescheduled te appointment for the technician to fit the part.. I am extremely disappointed with their service, considering the fact that they are an international company and I have a host of Siemens appliances.