What is my job specifically called?

Hello everyone,

I've been working in this position for 2 years but not knowing which is my position specifically to be called.
I really need your help, I want to put that perfect name to my CV.

My company is a factory that manufactures of paper packaging.
I am the person who directly contact customers and handle all of requests and orders.
- Quotation request: I send this to the R&D department, they send back the quotation and I send to the customers for approval.
- Sample request: I transfer the request to Design dept, after that I will do the production order (calculate materials need to used to make the sample and send that production order to every dept in my factory so they will start the production). Then I closely follow sample timeline and send the sample to customer for approval.
- PO (purchasing orders): when customer approved the sample, they send me the PO and I will also do production order (some of actions I describe above).
> I give all request of material in the PO to planning team and follow to make sure all material arrive on time.
> I work closely with the planning team to make sure my PO finished on time.
> I work closely with import export team and answer back to the customer request if they want to ship worldwide
> When goods are done, I give the delivery plan to delivery team to deliver to customer (if ship locally)
> After goods are all delivery, if customer complains any issues, I will have to work with relevant department to compensate to the customer all of unqualified goods.

My question is whether my job is called merchandiser or something else?
Thank you in advance. This question has been in my mind for 2 years, I will be very appreciated for your answer.