Sounds like a typical global company setting.
你應該有3 reporting lines:
On org chart report to local Finance
Dot line to business head: Marketing department
Responsible for requests from global Finance controlling
你的headcount應該在Finance，工作主要在marketing。要把兩邊關係理順，該管的強硬，該服務的有好態度，站好隊。
看起來這個職務的培訓很有問題，很可能是內部政治鬥爭的拉鋸戰
