Still not fully refunded

Buyer Beware - Don't order online because if anything goes wrong, then you may not get refunded. I ordered 2 similar items online. Both of which were listed as "In Stock" at the time of purchase. Each of the items was coming from a different supplier (which I was not aware of until after purchase). Turned out that both items were out of stock & so both had to be cancelled. I have since only received a refund for one item. After months of back & fourth with the call center & email correspondence with multiple customer service agents I have now given up hope. They seem to be unable to comprehend that 2 items were purchased & only 1 refunded. All I get is empty promises & a false proof of payment. A pdf showing that only 1 item was refunded, which they claim is proof that I was fully refunded. Each time you log a problem, you have to deal with a new customer service agent & then have to re-explain the problem hoping that the person of the other end has the mental capacity to understand the problem & see the resolution through to the end.