Had the same thing trouble with Analogic...massive overcharge on shipping.
Sent an email asking them to explain why they charged 30UKP when the stamp said UKP11 (ish..was a while back). Never got a reply. My advice...get a firm shipping cost from them before buying anything but, personally, I'll never do business with them again.
10-4 on "I'll never do business with them again"
I'm not expecting a refund on my unused shipping, I agreed and did pay it. Fine! I just want what I ordered.
Anyway, this is what they tried to pull today...
analogiccomputers has sent you a request to cancel the transaction for Amiga CD32 Games Console (400119409851).
Reason for request: Buyer's payment hasn't been received or hasn't cleared
So I dined there request and responded with PayPal transaction IDs for both payments.
I also went and raised a dispute on PayPal.
These guys are just playing games now. We'll see what they do next.
At least now I know where the "Anal" part of their name comes from. Thats where they stick the customers.