Bunduflip rooftop tent

We purchased a Bunduflip tent from Bundutec. We used it the first time three weeks after purchase and it leaked after approximately 5mm rain. When we contacted Bundutec, they informed us that they were aware of the problem. Why did they not inform us before we purchased the product? They collected the tent and gave us a new one which is apparently waterproof. Our brand new loadbars that were fixed to the tent on collection were returned unuseable (some parts were missing). They offered to refund us but we do like the tent a lot and it has a two year quarantee.