Flex pay denied

I attempted to order a shirt last week and the system could not, would not accept a different shipping address for delivery. I called customer service and she also could not succeed in selection of a different delivery address. I explained the item absolutely could not be delivered to the billing address as I was staying in a different location, yet the billing address could not be changed to match the shipping address as the billing address was linked to my credit card. I subsequently ended up cancelling the order altogether. Now, as I attempt to order an electronic item, I chose the flexpay option and suddenly receive an email “confirming” to me that my order has been cancelled with absolutely no explanation whatsoever, as if somehow I requested cancellation. I called customer service once more to be told that I have been denied the flexpay option but can reorder paying in full. My credit is decent, money in the bank, I do not understand their reasoning. I apparently will receive a letter in 7 to 10 days with an explanation. The whole idea of having HSN deny and cancel my order without any explanation, leaving me with the option of having to contact them to find out their policy, is the worst of customer service. I do not care how much or little money one makes, how much or how little a customer may spend, how often or infrequently they order, I have been in customer service for many years and treating a customer with disregard as this action did is wrong. I shop with several of the other shopping networks with their customer service policy being respectful and dignified. I can’t say if the first incident was somehow connected to the second incident, however I shopped with HSN years ago with no issues. I assume this is HSN policy and in no way reflects on those reps I spoke with as they were professional and kind but know this……. I have no problem paying twice as much with someone else to be treated as if my business matters. Thank you.