we are experiencing this ... my partner and i lived in a 2 bed flat for a year, we paid £130 a month three times and £40 the rest of the months yet we leave with a debit balance of £430?! baring in mind we slept in one room the other was used for storage, and half the lightbulbs were blown out too!!
I seriously doubt this has happened on purpose, have you only just checked? you must have been operating like this for months to run up a bill of £700. Just ask for your previous credit to be applied to the new account, and pay the difference and you will be back to all square.
Scottish Power should be regulated more by the powers that be They are causing disabled vunerable customers excessive long standing unecessary stress. They fail to address complaints effectively, they are nortorious for hiking up disabled cusotmers disiproportunate prices, In addition to this they fail to allow disabled customers access to the warm home front discount, applicatons for the W.H.D no applications are not on line, neither is there a telephone number for one to apply by phone, other fuel companies disclose the Warm Home discount on their websites & do not try to hide the discount as Scottish power constantly do. I have experienced nothing but distress & anxiety since being a customer which impacts greatly on my lung c ondition other health conditons & my mobility. I would not reccomend Scottish power their customer service is inconsistant during complaint closure procedures, nothing is actioned that has been agreed & not resoluted. Appauling service
Despite having a smart meter it's a good idea to send in a reading to get an accurate up to date bill. If your bills are estimated they could be totally wrong.