Service ransom

Phone the call center and was past from pillar to post. They promise to call me on numerous occasions an never did. If your account goes in arears then they just switch off service without giving any notification. Thus holding you to ransom to pay your account immediately an then must wait 48hrs to be reconnected. What i can't understand is that the previous owner ran up a bill 5 x what i owe and they never disconnected him even though the house was transfered on my name i requested them to disconnect it and eventually i had to pay for it. A simple phone call to notify you that services will be disconnected if they do not receive payment.