If the item does not match the description provided in the listing, you will want to return it to the
seller for a refund. You must use a Delivery Confirmed service for this, otherwise a seller can say
the item never arrived.
The following link will explain the procedure, with a link to the Resolution Center you can use:
http://pages.ebay.ca/help/buy/item-not-received.html
The important thing to note is that you must take action by day 45 (well, say Day 43 just to be safe).
You can certainly start sooner if you like. But after day 45, eBay/paypal will not help you.
If, however, you still want the item perhaps you can work out something with the seller whereby he
immediately sends the missing cord. I don't see how he can send you more gb, however.
Sometimes in a case like this a seller will offer a partial refund so you can purchase the cord elsewhere.
It sounds as if you are having no luck with the seller, though. Have you given him a reasonable amount
of time to get back to you?
As stated in the above link, try to work it out with the seller and if no luck there, go for the claim.
