Contacted them through email twice and chat once.
The first email resulted in them very quickly refunding my expediting shipping cost and apologizing for the delay. The second email I simply asked for them to change the shipping address to my home address since I will not be in the office the week following the holidays, at which point they did change the address, but also reinstated full cost of shipping which for international priority bumped up my bill 30%. This was not announced at all by the way, I only noticed it because I happened to be looking at another item which had been sent earlier in my history, and the invoice total looked higher than expected.
I immediately went onto chat and asked why my invoice total was revised and they told me that all charges are correct, I then spent 30 minutes in a chat session with them providing proof of my claims while the customer service rep told me that all the charges were legit and a result of me making unilateral order changes online. In the end, they told me that I was stuck with the increased cost, I told them that was unacceptable, and actually to my surprise after saying that they immediately folded and apologized for the confusion and as a good will gesture refunded the shipping costs.
They also mentioned that despite showing 2 in stock increasing to 6 in stock, the item was backordered.