Samsung tablet warranty issue

I purchased a brand new Samsung galaxy tab s6 last year (Aug 22 2020) from visions and just 2 weeks ago it died on me. I was using it then a blurry horizontal line came across the screen and it died. Waited a few hours charged it and it's completely dead.

Logged a warranty repair claim with Samsung as it was already registered with them in my Samsung account and shows its still under warranty. Samsung support gets me a FedEx return slip and I send it back to them.

It goes to a place in Ontario called FutureTel service centre. I get a response from them that my tablet main board, battery, sub main board are defective. They stated my device is out of warranty and it will cost $552 to repair. This is ridiculous as the device was purchased less than a year ago and I confirmed with Samsung support that it is still under warranty. I send them the purchase receipt invoice to proove this, waited 2 days and nothing. So I reply back to their email asking whats going on and provided my receipt again. I get a another email from FutureTel 15 mins after my follow up email to them, they sent me a reminder that I need to pay for the repair. They clearly don't care about the emails I sent them.

So I chat with Samsung support online few minutes later, spend an hour plus holding with them while they investigate and escalate the issue etc. I provided them my sales receipt showing its under a year. They then confirm my tablet is under warranty, they spoke with the service center and confirmed that my tablet will be fully repaired and returned back ro me at no charge under warranty. I confirmed this with them during the chat a few times and they assured me 100% nothing to worry about everything will get sorted at no cost.

I waited a few days and got a reply today from Samsung stating my service request was cancelled and the device is functioning correctly. In the same email also stated the device is out of warranty as per Samsung limited warranty policy. Come again?? They confirmed with me that the device was in fact defective and also confirmed with the service center it would be repaired under warranty. This makes no sense!

So speak to Samsung support today and spent over 2 hours over 1 our on hold in between messages. This person I spoke with was not helpful at all. First they say to ship my device back via FedEx and I told him that's already done look at the service ticket details. Then they say the battery is defective and not covered under warranty. I told him that's preposterous as this was all confirmed and sorted last week as several things were defective in the tablet (main board, sub main board etc), and Samsung confirmed the device will be repaired under warranty and they spoke to the service center. I was assured by them it would be repaired under warranty and returned to me at no cost. I provided this rep with the case number from the chat last week confirming all this. They said they have to escalate it again. I asked him why when it already was escalated twice last week and everything has been confirmed. They could not answer said they would have someone higher up contact me. Just absolutely ridiculous....

I am now worried they may not fix my tablet under warranty as they promised. This person wasted 2 hours getting absolutely nothing done.

Is there any further action I can take? I paid for the tablet using my Amex preferred card, they extend the warranty by 1 extra year. Any route through Amex I can take if this falls through?

Anyone have any similar experience with Samsung regarding a warranty claim?

If they drop the ball on this I am done with Samsung products.

Thanks.