You need to create just one single bridged WAN interface without any VLANS. And then mention VLAN in the router. Depends on the router.
What kind of router do you have?
here is guide for tplink
https://www.tp-link.com/us/support/faq/1585/
vlan setup for openwrt
I used Ping plotter and tried to play games on US and EU servers. And downloading torrent and game updates. Even with SQM there was stutter and ping spikes. I was setting SQM speed to 90-95% of PTCL's speed. After setting up vlans in router instead of vdsl modem and I also switched to Qosify...
QoS and packet management was not working properply for me, when I was setting up vlan ids for pppoe and iptv in the modem. Router was bridged with pppoe.
I was getting ping spikes and stutter even with QoS and packat management. Then I set up vlans separately in the router for IPTV and pppoe...
PTCL Landline phone service is also delivered via VLAN? Have you tried setting it up in your router? OR you are only using pppoe and IPTV vlan in your router and using ptcl ONT for landline phone service?
You have mentioned you are using ptcl ONT for IPTV and landline. Please can you try to set...