Sounds like a typical global company setting.
你应该有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应该在Finance,工作主要在marketing。要把两边关系理顺,该管的强硬,该服务的有好态度,站好队。
看起来这个职务的培训很有问题,很可能是内部政治斗争的拉锯战