Thank you for your clear outline of the course of events - it helps us enormously.
The first thing to say, of course, is that technically you have no contract with Dell - they supplied the reseller from whom you bought the original monitor. Your contract is with that reseller.
A Dell technician may well have told you that he would no longer deal with the reseller, but Dell cannot avoid its contractual obligation to that company - it has to resolve the problem via that route.
You decided to deal directly with Dell, and I can understand why - monitor issues are often easier to resolve in that way. As long as you understand that by doing so you are effectively surrendering your rights with regard to the reseller there's no problem. So far, so good.
The current situation is that you feel aggrieved at Dell's apparent wish to avoid its responsibilities. Let's address that concern.
The comment that the monitor was out of stock isn't surprising - Dell manufactures almost all its products to order, in an attempt to minimise stock-holding. I'm not in a position to make any other comment on that issue.
It isn't unusual for refurbished monitors to be sent out as replacements - many companies do this. As long as the supplied monitor is in excellent condition, and is covered by the same consumer protection legislation as a new item (which it will be) you don't have anything to worry about.
The lack of cables is obviously an oversight - Dell will surely supply a new set.
The confusion over the country in which you live is incomprehensible, but it seems to have been resolved.
"..am I being too pig headed or are Dell trying to duck out of their commitments..."
You are entitled to arrive at a satisfactory resolution with Dell, and that hasn't happened. Whether or not you are being pig-headed isn't for me to say, but I can understand your frustration. Dell is not a company that is known to avoid its warranty obligations.
I suggest that you get your cables from the company, and see how it goes with the monitor you have. You might make it plain to Dell that you expect it to honour its warranty terms with regard to this monitor as if it was a brand new item.