Not even worth the one star. I had a succession of calls from 01414470577. I rang back and when someone finally picked up the phone, I was told they are the Scottish Power debt collection unit. I asked for an explanation for the "non-payment" issue they claimed to be on my account - when my account was called up and viewed, they confirmed what Scottish Power Customer Services had previously told me - there is not, and never has been, any issue with it. Apparently Scottish Power couldn't be bothered to check that before they embarked on hassling me with calls alleging a non-existent issue. And once it was accepted they were in error, did they apologise for the stress caused? No, of course not. I shall be registering a formal complaint.