Thank you for your reply and getting your point across and explaining the situation better. There are a couple of things I would like to draw attention to as awareness and hopefully can be helpful to everyone.
First of all, the migration from E.on Energy to us at E.on Next it is something that cannot be changed and I am sure that email or letter (depending on the set up of your late mum's communication with us ) were sent out with all the documentation.
About the data bridge, I don't think that there has been any. I don't want to go in too many details in how the policy work as is long and boring, but briefly, I can say that we can take readings for a specific address, but if a person does not have the clearance with us we cannot discuss things such as bills or personal details. Although if you call us and you have an issue with a meter and you need some advice that does not breach data as specific details are not shared from our end.
Also, when it comes to refunds we do need some sort of proof, this is when the Will for example comes into place. Of course the situation could have been dealt differently if you don't have the following papers.
Furthermore, the bereavement process should have been dealt with within us at E.on Next. I am not sure why they have redirected you to E.on Energy.
I totally agree that more training and a specialist team is needed and please be aware that I have given feedback about this.
About your complaint, please feel free to message our social media team if you want extra support or information on how things are getting sorted for you.
I hope this is slightly helpful.
Stay safe,
Benedetta