Wylonus,
bank merges are a pure pain in the !"ยง.
I had so much trouble with that irl (not with Istaria), it cost me money, time and nerves, when I was in the same situation.
They ALL told me that they can`t help: old bank, new bank, service desks, call center.. well- that is poor!
Another time I nearly got all my acc closed (7 at that time), cause paypal was not able to work with my cc (nothing had changed at that time- it was a simple bug) and I phoned and mailed with paypal for weeks- without success.
So pls do not blame the wrong ones for the misery.
Though I understand you anger!
And pls do not overvalue accessable customer services: It is very expensive and of poor effiency.
Contact our support again- I`m sure there is a way to pay your account, besides cc.