my ONU device has 4 lan ports but it seems only 1 port works.

1) were my onu device working properly, would i get internet(and lan) for 2 pc simultaneously?

if yes then,
2) will i request l3 to change my onu...
in the fb group there are a lot of complains about onu. should i change it or just buy a BDT200 usb lan converter to get internet for 2 pc?