i was trying to buy some stuff and kept receiving error codes, i felt suspicious and gave up, then all the sudden i received an email from them saying that they are processing my payment. (even though i didn't authorize the payment correctly since i kept receiving the error codes)

i contacted my bank(bank of america) and they told that i need to wait till my payment is completely processed then i can file a dispute.(i hope this works good) I emailed the merchant to cancel my order that i didn't even properly order immediately and return the money back but they haven't got back to me, even though they quickly responded to me when i asked them about the error codes in the very beginning saying that i should tell them what the code was so that they can assist me better (this makes no sense btw).

What can I do here?