I have a feeling that the seller is not going to send the coins to you.   That would be my interpretation of the messages between you.

You did in fact receive a quick reply to your initial enquiry as to whether he had received payment and I doubt if he understood why you asked him to adjust his account settings....there was nothing wrong with them.

What it amounts to is that you cancelled several payments to the seller and I have a feeling he wants nothing more to do with it.

When the refunds have been processed the item should then show up in your purchase history as waiting to be paid for.  You can try again to pay but it will only work if the seller has not cancelled the transaction and blocked you.