Thank you Emily but I have followed up with CISAS multiple times and Virgin has ignored them.
Even more insulting you've put my account in default when you owe me money. I'm calling OfCom tomorrow to complain as clearly the ADR scheme doesn't work if Virgin simply ignores the CISAS ruling.
Please don't say 'your processes don't allow you to ignore CISAS rulings' as that is clearly not true, I have a formal ruling from CISAS dated 21st October 2020 as a result of which Virgin owes me £36.08, yet somehow on 1st January 2021 you marked my account as in default with a credit agency when you owe me money so you have demonstrably ignored the CISAS ruling.
To everyone else reading this be warned about Virgin's behaviour and think very carefully, even if they are the fastest in your area, is this the kind of customer service you really want to deal with.