I have purchased an excellent resources, however when I try to access the link for the PowerPoint it can't be found - this is essential to make the lessons work. I have tried to leave a message for the seller, but I haven't had resources sent. This is extremely frustrating, especially as the resource has cost money. Is there a way to obtain a refund if the accompanying material is not sent within a given amount of time? I know this is harsh, but the products have not been fairly sold.