I'm with SSE and for years I have been challenging my energy bills. I currently pay £250 per month and just received a bill today, saying I owe another £786.00 ! 😥 I had a d/d set up for this amount and in Oct/Nov they changed it to £430, so I cancelled d/d and continued to pay £250.
Martin Lewis's update is you must NOT stop paying, but rather put in an official complaint, this should stop further chasing/action until resolved. ( it never did with me ) For every complaint to the ombudsman it's cost SSE ( or other ) £500 per complaint.
You should also request a SAR, which is EVERYTHING the company holds about you, which they are legally obliged to provide within a month, or they will get a further fine. ( this takes time and a lot of paperwork )
I live in a semi detached 2 adults ( 1 wfh ) and a teenager. We have gas oven/radiators, the combi boiler.
I don't know what else I can do to lower my useage. ( havn't used the oven/grill ) for 10 months!