The way he phrased it he was locked out of his account because of this non-transaction, but he previously stated that the apparent pre-authorisation hadn't affected breached his credit limit and he didn't need to buy anything on the card.
So yes, all sorts of things can cause someone to be locked out of their account, (as opposed to their credit card account), but if he was it is a remarkable coincidence.
His latest post even muddies the waters even more, as how did he know anything about the non-transaction. The only way, if he couldn't access the credit card account, would be that he rang the bank to find out after hearing nothing from Plusnet in the first place. In which case I'm sure the pre-auth thing would have been explained to him there and then. Which seems from the OP happened, except he didn't really understand.
Interesting that earlier he said he didn't want a D/D. Maybe his account was blocked at the time, but it's nothing to do with this palaver. Does any ISP not require direct debits?
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