First said my box must be at fault and could send a new one but my model no longer made and I could only have the upgraded Tivo box if I switched to their broadband (which I don't want)
TiVo boxes are no longer supported for replacements and any TiVo deemed faulty will be replaced with a V6 (or TV360 if you choose to convert).
Unfortunately for you, TiVo has its own inbuilt modem for all the online functionality - V6 don't work like this and require the use of VM home broadband for the same internet-based services (OnDemand etc). It needs to be VM broadband, not anyone else.
Sorry to say, these are non-negotiables now - if you want VM TV service, you need to have VM broadband.
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