we have had heaps of hassle with scottish hydro too. they are one of the worst power supply companies there is. we have been waiting 6 weeks for a letter (which was supposed to take a couple of days) with the new amount of our direct debit payments. notes were made on our account that we were still waiting for the letter but we were threatned with disconnection.
as soon as we can we are changing to eon. they seem to be the best for us at the moment.