Yes, I have been calling every day too. I was told if I make a new Apple ID, use a different credit card, and ship it to a different address, I should be able to order it. Another person told me that I shouldn't have to use a new shipping address, that it's tied to my credit card. Either way, I want to use the same credit card because I will get certain rewards/perks for this purchase.
They did escalate it to a manager, and they thought the manager would have the power to reset the system (but no guarantees). They said normally a manager can respond in 1 day, but they are so backed up because of COVID-19, the average wait time for an escalation is 5-7 business days. It's so insanely frustrating, but I'm willing to wait the 7 days because of the great perks I'll get for this purchase with one specific credit card. If it's not solved in a week, I'll probably try using a different credit card.
Had I known I would receive such severe punishment for cancelling the order, I never would have. On amazon and other websites, you simply cancel and reorder immediately, no problem. Please, everyone who contacts support about this, tell them to add a warning on the cancellation page about not being able to reorder after you cancel! Some communication about this horrible consequence would have been helpful beforehand! I was just cancelling to change something minor about my order, which could have been done by customer service, but I was trying to save myself the hassle of contacting them, believe it or not!