Utterly horrendous. Bills of £77 per month for 11 months then all of a sudden a bill for and additional £600 in last month of contract. Admitted responsibility for error, no resolution over now nearly 5 months. Debt collection letters and threats, harassment calls to pay debt not owed 3x a day, complaint not responded to, unreachable when you try to call them even with the automated system calling you back. 9 different bills amounts sent out over the last 2 months. Blocked move to another supplier 4x times locking us into a standard tariff. Reporting to Ofgem next, AVOID THIS SHAMBLES OF A COMPANY AT ALL COSTS!!!!