False advertising on online goods

I bought a stretcher from Takealot (Oztrail easy fold queen size) It states that it is designed for queen size mattresses. None of the mattresses I bought fitted on the stretcher. After investigating I found that the size of the stretcher is only 200x144x42 cm in width, which is smaller than Our average width of 150 cm or more in South Africa. None of this dimensions were shown on takealot website. I cant do anything with this stretcher as the mattress is either to small or to big to fit onto it. I feel this is false advertising as the size is not queen size.