Just for info, your original post has been merged in this thread 

Hi @GrumpyTrucker, yes I agree that the time frame of 6 weeks is very normal for all account and meter details to be updated following a meter exchange. 

But - and here's the thing that's confusing me - no one in support can, or will, answer why or how it worked perfectly for three days (smart readings were being sent and the IHDs were displaying meter data) then the meters stopped sending readings and the IHDs disconnected at exactly the same time. Almost like the meters were decommissioned at the DCC end of things. No one will explain why the gas readings aren't even being estimated unlike the electric,  the electric meter now says TOU Rate 1 instead of Total Active Import, and the HAN signal strength has disappeared. That can't be normal.

But it's like no one will even consider there may be an issue before 6 weeks. Well, I think if I were a betting man I'd say that at the end of 6 weeks there'll.be no change. Then I'll have to wait probably another month at least for an engineer appointment. It's just getting me down now that's all.

@GrumpyTrucker if you haven't already you could keep an eye on one of the ofgem regulated 3rd party apps to see when/if they can start seeing 30min readings given you say data has stopped on the ovo website. 

https://hugoenergyapp.co.uk/

They don't pull off exactly the same data as suppliers so be careful drawing conclusions. They don't get daily readings that OVO use for billing, they only get 30min readings and add these up. This isn't the same.

So they don't get data you see on the ovo meter reading pages

https://account.ovoenergy.com/meter-readings

But do get the 30min data you see on the ovo daily usage page

https://account.ovoenergy.com/usage?datePeriod=daily&unit=kwh