Dell Canada (Horrifying Botched Order & Customer Service Experience)

Ordered 2 items from Dell back in early May 2020: Powerline adapter (kit of 2) and an USB to Ethernet Adapter for an total of $84.73.
After weeks has passed an no update/response; I called Customer Support for an update and was informed that the powerline kit is no longer available and would not be shipped; that as an courtesy she would open an ticket for me to cancel that product. However after a few days; my order was shipped but I was still charged the full amount (even the shipping manifest in my order said both items shipped but I only received the USB ethernet adapter; I've called at least 2 times for them to investigate this and finally after weeks of waiting/calling; I received a refund (incorrect). The e-mail said the refound would be $59.99+tax (the actual amount I received is $52.50). I've since e-mailed them back; but it's been 4 businesses days and no response... what a joke.
Edit: Excuse the horrible grammar and spelling errors; I was extremely frustrated when I wrote this post...

Order Timeline:
Order Confirmation via e-mail: May 7th
Customer Service Call: May 25th (ticket opened to cancel powerline kit as it's NOT available).
Order Invoice: May 29th (I was billed the full order amount)
Customer Service Call: June 9th (regarding billing error)
Customer Service Call: June 18th (regarding billing error)
Dell E-mail Refund Statement: July 12th (Yes; this arrived AFTER I received the incorrect refund; no idea how this works but you can verify from my screenshot).
Refund on CC: July 7th (Incorrect amount)

I have all the e-mails / chat log history / CC statement to back up all of this. How can a company been around so long get this so wrong?