This is a shock, honestly! I would normally pay by bank transfer for whole year up front.
But OK... Except.
Err, OK, so do I have to turn up each month with cash which they cannot accept?
To be fair, if that saved me over £3k a year in council tax, I'd do it. I'd video record each attempt to pay, obviously, for a judge if they tried to take me to court.
Apparently "Cash is the default payment method that the council tax system uses for payments other than direct debit. This does not mean that the payment has to be made in cash."
As they seem confused, I have asked...
We'll see.