Wrong Device sent

I am writing to formally express my frustration and disappointment with the handling of my recent device order and the complete lack of resolution since.
On December 13th, I placed an in-store order for an iPhone 17. I was informed at the time that the device was not in stock but would be delivered within 2–3 days. That timeframe was not met. On Friday, December 19th, FedEx marked the package as “attempted delivery,” despite no knock, doorbell, or notice. The package appeared to go between multiple locations before it was finally delivered on Sunday, December 21st.
When I opened the package, I discovered that I had been sent the wrong device an iPhone 16 Plus instead of the iPhone 17 I ordered.
I immediately contacted customer service, at which point a ticket was supposedly created. Since then, I have been sent back and forth between customer service and the corporate store several separate times. The corporate store is 35 minutes away, yet each visit has resulted in no progress, no ownership of the issue, and no solution. No one seems to know how to resolve this, and I am left completely stuck.
I am unable to return the device, unable to switch mobile services, and effectively being held financially liable for a phone I did not order and cannot use properly. This situation has now dragged on for nearly a month. The only compensation offered for this entire ordeal was a $40 credit, which is frankly insulting given the time, stress, and inconvenience caused.
I have been a loyal customer for over 8 years, and this experience has been utterly unacceptable. I am requesting immediate action to correct this issue, including proper fulfillment of my original order or a clear and fair resolution without further burden placed on me. This situation has caused significant frustration, and I expect it to be taken seriously.