Over priced postage

[marleyboy516]

I bid on 2 items which I won, now to give you an idea you can send 7 Polly Pocket Compacts 2nd class economy delivery for £2.85, which I have done and which I have recieved, the item I bid on was one of the smallest Polly compacts you can buy, the other item was a crochet waistcoat (I'm a size 6) so it's very small, when I make payments I tend to wait until I have recieved invoices fron 4-5 sellers and pay in one transaction easier for banking, now my point these tiny 2 little items I'm being charged £6 postage ebay rules state clearly sellers are not allowed to make a profit from postage, claim petrol money, time taken to post etc etc, I stupidly paid all my invoices everyone was honest apart from this one seller, am I entitled to cancel this purchase now due to seller commiting fraud?