i-Party's baking chocolate not a good quality

I bought baking/cooking chocolate from i-Party in Westdene, Bloemfontein. It melted perfectly but when it stabilized again it was grainy and had a candle wax texture and even tasted that way too. It was really unpleasant in the mouth. I have been baking for many years and I know how to work with chocolate. This was such a disappointment as I was really looking forward to using their products for my latest and newest deserts. Please i-Party, the quality of your chocolate is not up to standard. Even if it means you would need to charge more, rather sell a decent chocolate to the public...a better quality of chocolate PLEASE. I can guarantee you, your customers will choose quality over quantity. Thank you.