Intersango has no interest in doing business with people who threaten litigation without a good faith effort to resolve the problem first.
He opened a ticket and immediately threatened us.
That is completely unacceptable behaviour.
So, you're claiming that what's written in OP is not correct?
Because according to OP, he said he'd be "seeking legal advice", what's not a threat of litigation. And, also according to OP, that only happened 5 days after the ticket being opened, not "immediately".