An independent review might flush out the reasons and breathe new life into things? Or it may be that one side has not communicated a business change or an issue.
Maybe it's time to refresh things. Perhaps governance has become a little laissez-faire? An independent review will help both sides decide on a mutually acceptable way forward.
Perhaps the Contract needs reviewing and restructuring to help improve collaboration?
Maybe they're losing money, or the service is no longer core to their mission. An independent review will flush this out and help build a way forward.
An independent review might flush out the reasons and breathe new life into things? Or it may be that one side has not communicated a business change or an issue.
Are you engaged correctly? A 360-degree assessment should help build the right plan?
It sounds like the status quo needs to change and some honest discussions are needed to bring clarity for both sides.
Maybe they can't afford to pay, or they don't understand your perspective. An independent review will flush this out and help build a way forward.