Incorrect goods

I purchased a wireless keyboard and mouse on groupon on the 25 Feb, when the package arrived today, I received a bamboo keyboard, with no mouse. I tried to call the number in Cape Town, but got a answering machine saying that I have to call back on Monday. I it is very difficult to get hold of groupon so that they can rectify the mistake, why don't they have a call centre number, if they do, i did not find it.