A Superuser should comment - but these stats reveal that you have an issue with your downstream connection (probably noise ingress) as the SNR's are mostly below the 34dBmV lower recommended limit and there are lots of PostRS errors in those channels. A technician visit is required - call it in or wait a day or two for a VM person to pick this up.
-------------------- Services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.
I'm really sorry that your broadband issue is ongoing and that you've had difficulty resolving this.
In taking a look at the backend of your account, I can see that your downstream SNR is low on most channels, as well as having high upstream power levels. I'm glad you've been able to arrange an engineer visit, as this is certainly what I'd recommend.
Please keep us posted regarding the appointment and let us know whether they're able to restore full functionality.