We're given to understand that the reason ROL didn't pay the invoice is that the invoice wasn't for the sum agreed and that paying (or even part paying) that invoice would indicate acceptance of the new charge. Castle have said this "interpretation is wrong". As the increase is (I think) reported as 850% (I think I mistakenly said 900% earlier) I'm sure that you, as a customer would be unhappy about that increase.
NB I understood Castle to say that the price increase did not relate to authorised products but I'm confused how Castle might be invoicing for "unauthorised products" or "products not capable of being authorised". (I'm open to guidance here from anyone else who was at last night's conference).
What Castle can offer the third parties immediately is unlikely to be (I would say certainly not) suitable. What they all appear to need *now!* is RO 4.39 and only ROL can offer that.