Just had a bombshell dropped on us. We pay our electric monthly on a 2 year deal and they have said we have went over by 30,000 kWh.

2 years ago we were paying £90 a month, then it jumped to £160.
We have 4 in the cottage, no electric heaters, tumble dryer or emerser. We have oil heating and everyone out during the day.
Scottish power have said they think we have a faulty meter!!!
I went on the net and apparently the average household up here is no more than £600 pa or about 4,000 kWh & we're over by 30,000
What's the chance of getting some redress, as we are paying far too much??
Any thoughts