4G Carrier does not open port for me to create 4Gproxy

Hello friends! I want to create some 4g proxies here in Brazil, but I’m having a hard time releasing 1 port on each chip … the only argument I thought of using is that I need to connect my 4g internet to a DVR camera that uses a connection port. … but it didn’t work, they told me to hire a more expensive plan to release the door …

Does anyone out there have a good argument that I can use to request the release of 1 port? Something that makes a lot of sense for me to ask?

PS: I do not say that I will create proxy, not to make even more hard.