If it cannot be counted, it cannot be defended
The characteristic failure of agency quoting is a scope written in the language of services rather than of outputs. Social media management. Content marketing. Brand support. Each of these describes a category of work with no natural boundary, and each will be interpreted by a client according to what they need this month.
A countable scope changes the conversation without changing the relationship. Twelve posts, two long-form pieces, one campaign concept, monthly reporting, two rounds of amends on each. Nothing there is unfriendly. It simply means that when a thirteenth post is needed, both parties are looking at the same document, and the discussion is about adding something rather than about what was always implied.
