E.ON Next uses the Kraken IT platform by Octopus Tech. So it gets monthly billing.
E.ON has bought OVO, whihc uses it's own IT platform.
E.ON owns power generators. It has transferred its domestic customers to E.ON Next, where it assigns its renewable output. It sells its dirty energy for cheap to Utility Warehouse to push through its MLM model
It has developed EV tariffs that have attracted many new customers.
Like many Energy companies, several Facebook groups have sprung up where customers help each other, but like many groups on FB, beware of scammers or people whose interests aren't your own. While there can be good advice, there can also be plenty of misinformation.