It seems like I did not notice your network configuration issues. The Interface in the physical settings of the LAN interface should be eth0 and Bridge interfaces should be enabled.
For the WAN settings, open the WAN interface, change the protocol to PPPoE, enter the credentials, and in the advanced settings specify the VLAN tag ID. In the physical settings, bridge interfaces option should be disabled, and as the interface, eth1 should be selected.
The way you have configured it now, you are directly bridging the WAN and LAN interfaces (as your ISP told you).
As for the mob1s1a1 and mob1s2a1 interfaces, these are the mobile interfaces, but they should be hidden in the RUTX10. I will report it to our RnD department, however, it should not affect the functionality of the device.
Let me know how it goes!