https://www.thecourier.co.uk/fp/news/angus-mearns/4952043/british-gas-repeat-arbroath-bill-blunder/
After what seems a genuine error, Jim here runs to the Courier and they "intervene" to get him £300 compo.
Another small error occurs and Jim heads to the CAB, receiving £30 compo this time.
Lesson learnt. Get the papers involved if you want some proper compo.