Product: Credit card or prepaid card

I am, XXXX XXXX On XX/XX/XXXX contacted my Capital One Bank, regarding a dispute/case number # XXXX, asked to step in and find resolution regarding charge for goods I did not receive. But they are refusing to solve the problem. Turning case in a favor of merchant, who just tells my bank that item I did not receive, was delivered based on a tracking. 
On XX/XX/XXXX I made a online purchase using Capital One QuickSilver credit card from XXXX in amount of {$51000.00}. Computer parts were ordered. Order number is # XXXX XXXX shipped my order without signature request and sent me an email soon that package was delivered on XX/XX/XXXX at XXXX when I was not at home. When I came home I could not find where exactly delivery person left my package or to whom it was given. That day my neighbors did not see any packages for me. 
I contacted XXXX ( carrier ) directly trying to find where my package is, but they were unable to assist me telling to contact online store directly. 
I contacted XXXX, mentioning I never received goods I paid for, asking to help and to find out where my package is. XXXX states that it was left outside on a porch in front of our main entrance door. 
On XX/XX/XXXX, at the time when a first call to XXXX was made customer support was unable to provide an option for replacement because one or both items were out of stock and they opened a package search claim for me. Representative also mentioned that I will receive a full refund most likely. Please review attached copy of the email they sent me. All my calls with them were recorded. 
Meanwhile I went to XXXX precinct, our police department and asked to step in. Filed forms with them and later received a police report by mail. 
On XX/XX/XXXX XXXX sent me an email Resolution Regarding Your XXXX  Claim # XXXX where they wrote things making no sense for me : This email is in reference to your Claim # XXXX. We have reached out to the carrier and filed a lost claim on your behalf. After a thorough investigation, the carrier confirmed that the package was delivered to the correct address on the order on XX/XX/XXXX and left at front door, therefore the claim has been closed as denied. We are sorry but we are unable to further assist you with the claim at this time. Thank you for your understanding in this matter. 
I called XXXX again and opened a dispute with them, which was closed as well. Their support team member kept repeating that tracking shows package delivered. They dont have any further proof where exactly package was delivered or to whom my package was given. 
On XX/XX/XXXX XXXX sent me another email with attachment where XXXX gave a false fraudulent statement to XXXX about Receipt of the above shipment has been acknowledged by XXXX XXXX : Here is the document from XXXX stating the package was delivered correctly. Thank you for your understanding in this matter. With attached pdf file named it XXXX I never informed/confirmed to XXXX about receiving a package. This is a false statement. When XXXX called me about this package I confirmed them that I did not receive it. 
Nobody signed for the package. 
Also I am not the person who picked XXXX as a shipping company. When online order was made through XXXX  there was option free shipping, but no further details. Later XXXX tracking was added. 
On XX/XX/XXXX I opened a claim with Capital One bank regarding issues with this online purchase. From the beginning I never mentioned to XXXX nor Capital One representative that wanted to cancel my order. 
Capital One received from me all emails where I tried to solve issue directly with XXXX  and police report, but denied them all and closed claim and dispute too.