Had problems over the last 3 years on our property rented to tenants. Npower even cut the tenants off & installed a prepayment meter, frantic tenants rang us whilst we were away so totally ruined our holiday. It took 7 months to resolve through their Management complaints, we begged the tenants to change to another supplier but of course they were too lazy to do anything now 6months on the we are now getting the same problem npower keeps billing tenants that have left& even though I advise them & provide meter readings their records are never updated, & my phone provider charges me for the 55 minutes spent phoning Npower. Pity the regulator can't fine them a really huge amount.