Laptopz eBay Store

Review: I tried purchasing a battery replacement for my laptop on Ebay on ** February 2013 and paid it through Paypal. The seller said the item was shipped but until now I still have not received it and its been taking so long. The link is : http[redacted] I was advised 3-5weeks delivery transit and was given a tracking number. I tried checking the shipment using the Confirmation Number: [redacted] given to me but was advised by Ebay that it is invalid. I also contacted my local Australia post about it but was advised it is indeed invalid. Because of this, I contacted the seller and they reasoned out that the item might have "gotten lost along the way" and offered to send a new battery instead with another lead time of 3-5 weeks. The 2nd confirmation number giver to me was[redacted], shipped out on April ** this year. Again, I tried checking the said confirmation number through USPS website but still got no result. Same with my local post. I tried communicating this with the seller and they kept on insisting that the item was shipped on time but just cant be tracked online. THey also offered a 10% discount on the item due to the inconvenience which I accepted in good faith. On ** April I asked them why the new shipment cannot be tracked to which I received no answer. On June * 2013 I tried asking for a refund from the seller since no item arrived, but they refused. They then offered to give less than 30% of the sale price which I refused. I asked for the full refund as they have deceived me by providing false tracking numbers on both occasions, however I have failed to receive a response.Desired Settlement: Refund in full via Paypal of $25.50.