Optus DNS issues

[JasonDK]

I am unable to access a whole bunch of websites and servers on Optus mobile broadband. This started about 5 days ago.
Using the Google DNS settings works fine and if I use a VPN it works fine. This is happening on all devices both on my Optus mobile and on my Optus wireless broadband. What's going on??

[JasonDK]

PING 49.197.203.117 (49.197.203.117) 56(84) bytes of data.

--- 49.197.203.117 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 3999ms

[10000000000GB]

Couple of months ago, the whole Optus DNS went down in the evening.

[Aman_B]

So sorry on our late reply to your post @JasonDK. Had you managed to have a chat with our faults team → 131344. If so had you been provided with any fault reference numbers that we can follow up for you? Happy to help.