Volt benefits only applied to one phone line

I shall attempt to condense conversations I've had with O2 in regard to Volt benefits only being applied to one of the phone lines on our account.

I needed to manually request Volt benefits via the O2 app as our (Myself and wife) broadband was set up in my name (Peter) and Phones set up in her name (Katrina).

When this was processed the Volt benefits were only applied to one of the phone lines (my wife's). Between myself and wife we have spent many days trying to resolve the issue with O2. It seemed that O2 finally understood the issue and would apply the benefit to my phone line. Unfortunately they have passed this to Virgin who have emailed me, but don't seem to have been sent all the conversations we've had with O2.

I have tried to reply to Virgin's email, but it does accept replies. Virgin's Twitter/X won't accept DMs and I've not found a way to contact Virgin on their website. So I'm hoping someone can advise/help here.

The email I received from Virgin, in brief, states that they confirm that our account is eligible for Volt benefits (this wasn't at question), that benefits will be applied automatically within 14 days (hasn't happened due to different first names on Virgin and O2 accounts) and finally that if this doesn't happen automatically I should request it via My02 (It is impossible for me to request Volt via My 02 as it states we already have it. MyO2 does not realise that it has only been applied to one of the phone numbers.)

Please advise how I can request for someone at Virgin to apply the benefits manually.