@
milleniumaire
It seems to me that the reply consists of 3 different pre-prepared answers compiled together which cumulatively make no sense.
So are the reads getting through to your account Yes or No? If Yes the the WAN, the DCC, the eon next BOL are all working fine, at least in an outward direction. If No then one of those features is letting the side down.
Are your meters showing the correct Tariff details? These are sent from E.On Next the other way. if the details are not correct then they might not have been sent, or the inward communication is deficient.
Your information for the IHD comes from the meters via the communications hub attached to the electricity meter (via the HAN) - its all done locally. If the data is wrong on the IHD but correct on the meters themselves then there is a fault in either the comms hub or the IHD.
I note that you are continuing to press on this, but so long as you can read the meters locally and submit them E.ON Next will not carry out any fix to your in home equipment. They will though try to solve communication issues through the DCC where they can. In my view there is no point in trying to resolve the IHD matter until the other aspects have been sorted.
I fear you are doing the electronic equivalent of banging your head against a brick wall. It might not be as painful but might be just as pointless.