We started off on what we thought was a good rate offered to us by Scottish power, shortly after, we had a smart meter installed by Scottish power, over the months the price increased very quickly..Due to the ongoing large increases. we opted to move company . We were sent a huge bill based on an estimate even though they had access to the reading on the smart meter.. we asked for a more accurate bill based on the meter reading, on several occasions, that never materialised, instead, we were sent escalated demands by email, letters and phone. They insisted on the estimated amount to be paid even though they had access to the smart meter reading. The only good point was that everyone I spoke to were very nice and tried to be as helpful as they could. Bad thing was that We were never able to speak to anyone in authority.