[jimworcs]

The link to BA has no relevance to this topic. If AC wanted to tell the customer clearly that there is no refund of a non refundable ticket, then they could be as clear as BA and state it in black and white. That is not what happened here.

Do you receive special training at AC in obfuscation?

These are the facts:

The OP had a credit or voucher to the value of $280.

The OP sought to purchase a ticket for $191.

AC, after applying the "voucher" managed to contrive their "special maths" to demand an additional $104.

If the OP had a voucher for $280 and had to pay $104, then the ticket is costing him $384 in the real world.

Let me explain how this works, as it is clear that AC operates in a parallel universe. You add the $104 to the existing credit of $280. This equals $384.

As the ticket is on sale for $191, this means that AC has levied charges of $193 on the purchase of a $191 ticket.

It is ludicrous. AC would have to defend in court how they can justify either:

Misleading the OP as to how much the "credit voucher" is worth

OR

Explain the parallel universe maths applied in your "clarification".

Either way, it is bonkers