All I did was ask a question via email, and a customer service rep cancelled my entire pre-order

Question

So the other day I emailed bestbuy.ca customer service to ask them a question related to my E3 pre-order. Included in the order was a Ps4 Nyko Type Pad, and I asked if it is possible to cancel this single item in the order, and if it was, to do so. 
Key to note that included among this E3 pre-order was a PS4 Fall-Out 4: Pip-boy edition, which is now sold out across North America. 
The customer service rep took it upon himself to play trial and error with this order instead of actually knowing what he was doing and ended up cancelling the entire order and losing me my Pip-Boy Edition. 
I have been emailing endlessly trying to explain how this is a bigger mistake than they are making it seem and have only gotten responses asking me to do something about it, not Bestbuy fix their mistake.. absolutely terrible customer service. 
This was the question I asked (a), and the initial response I received (b).
(a) my initial question
Is it possible to cancel only one item of this pre-order? I would like to cancel the Nyko Type Pad if possible, but not any of the other items.
(b) First bestbuy.ca response
Dear ______,
Thank you for contacting Best Buy Canada regarding Order # 
We are sorry but when we tried to cancel the game in the order it doesn't work. When we tried to cancel it in second attempt it does, however your whole order got cancelled. We sincerely apologized for the inconvenience this has caused you.
We kindly ask you to place another order online for all the games in the order and we will adjust the price if there are changes. You can also call 1-866-237-8289 options 1, 1, 3, and 2. One of our representatives will happy to place an order for you.
Thank you for choosing Best Buy Canada. We look forward to serving you in the future.
Sincerely,
xx TA
Best Buy Canada
Further emails have only received predictable copy and paste responses, explaining that Fallout 4 Pip Boy Edition is out of stock, and to check local stores. Completely ignoring the issue I was raising. 
My second email
This is absolutely in excusable and needs to be fixed on your end.
One of the items in the pre-order that you cancelled has been sold out online almost since it was made available (Fall Out 4: Pip-Boy Edition, Playstation 4). Now that you have cancelled the order I have no way of receiving this item. It is sold out in every location. How is this going to be fixed?
Second bestbuy.ca response
Dear ____,
We have received your email regarding the stock availability of Fall Out 4: Pip-Boy Edition, Playstation 4 on Bestbuy.ca.
Our website does show this product as ‘Sold Out’.  It is possible that we will receive more stock of this item however we are not sure when as there are no pending purchase orders through the vendor.  As such, we are unable to provide any details as to when we may have stock available for online purchasing.
Our online inventory is pulled from different inventory than your local store, so provided the item is not a web only item, they may have available stock.  Try using the store stock check (on the Product Detail Page) to view stock availability or contact your local store directly.
Thank you for choosing Bestbuy.ca
Sincerely,
.TA
Bestbuy.ca
Great reading comprehension. The email wasnt about the availability of the game, the email was about the mistake made by a customer service rep. And no, no more stock is being made available, as Bethesda has said so. Just a terrible, terrible case of customer service.
Consider me, a lost, long-time, customer. 

Answer 1

Very sorry to hear about this ! 
If you haven't had a resolution to this matter over the weekend, please send me a private message with your order number and contact details. I'd be happy to escalate to our Customer Experience team here. 
Best,