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I'm sorry to hear you have a few issues, I'll be more than happy to look into getting these resolved for you. I've found your account, however I'm struggling to get the coax sent out to you as I'm greeted with an error I'm afraid. Would you be happy for me to arrange an engineer visit for you so the cables can be replaced that way?
In regards to your My Virgin Media account issue - are you still able to access the old NTL World email account? Have you also tried resetting your My Virgin Media password online to see if that helps?
Lastly, did the team advise why they able to upgrade your tivo box to a V6? Was this part of a package upgrade you requested or something else?