We believe that partial information can be misleading and therefore we'd like to spend few lines on this post. (though this is not the right thread)
We must show on the invoice the price and the discount applied. It is the law. We cannot show just the discounted price: for consumer rights, we must show the price and the discount so that they are sure that the seller is not cheating them.
Customers from non EU countries do not pay VAT; we deduct VAT entirely but we are not responsible for local duties and customs. The way Canadian import taxes are calculated does not depend on us and we can't do anything for that.
I've read all the emails between you and our guys and I think you were aware of all this and you could ask for cancellation even if your order had been already dispatched.
We are extremely sorry you're not happy with Dot but your comment does not reflect facts.
I just wanted to make things clear on that :-)