I have the exact issue.
They never sent me an invoice for technical assistance to my fibre network a few months ago. I never requested the service, did not sign anything, and they sent me a statement containing this invoice about 3 months after my Account was closed with them. I can't even log...
I got prepaid electricity and the units are done. The power went off. I bought units. The recharging unit does not go on to input the units. I plugged it in at work. Does not take the units.