Re:comeback?
The only way forward is to get the company who did the original installation and the Virgin installation team to talk to each other so as they each understand the other's systems. They should then certainly be able to agree to the correct solution, but will probably disagree about responsibility.
I would suggest that it is the builder, who contracted the original installation, who should 'project manage' this side of things, by bringing both companies to the table and banging heads together, but also warn you not to hold your breath.
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