Category Manager denying movement of GL

I have a product that I am trying to sell through Vendor Flex but facing issues while listing it
When I raised a case, I got a response that they need to Add RC to the product and later I got the following response:
We can not proceed with the RC addition request as adding the RC will change the GL from its current GL “gl_biss” to GL “gl_personal_care_appliances ” and the concerned CM has rejected the request for GL movement.
It is important to note that both my competitors are able to sell the product through Vendor but I am not able to

On contacting seller support I got a response that they can change the GL, I asked them to change it but it is not happening

My question is

What is RC Addition How can I get the GL changed? Is there any way to contact the Category Manager?