You only have one Upstream Channel, we would expect to see four and the power level on that channel is far too high.
You will need an engineer visit to get it fixed.
You can contact VM to report your problem using ...
Text service on 07533051809
150 from Virgin landline.
0345 454 1111 from any other UK phone.
The best time to call is weekdays 08:00 to get a UK agent, anything after 10:00 you must realise that you are quite likely to get through to an offshore agent that doesn't speak English as a first language.
Or you can wait on here for one of the VM Staff to pick up the thread but this may take a few days.