Why I won't buy from Valuegro

I saw these amazing plastic clipboards and I asked where they were from, and I was told Valuegro. I then called Valuegro and ordered these clipboards. They delivered the wrong ones. I called them and they said they would exchange them that very day, low and behold... nothing. For the next 3 months I received an invoice for these clipboards, each time replying that they had delivered the wrong ones, and I wanted the correct ones. Eventually I got an extremely rude phone call asking why I hadn't paid for the clipboards which they delivered, I again explained they were the wrong ones. Then today they came to collect their clipboards, no new clipboards, no explanation, nothing. Now you tell me, if a company cannot even organize you to get the 3 correct clipboards you ordered, how are they supposed to deal with bigger orders.... Stay far away.