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
