Unresolved account

When I switched over a year ago I made a mistake in submitting a meter reading. This caused a problem with npower my last supplier. Meter readings have now been agreed and were supposed to be applied to my account. I was supposed to take 2 to 3 weeks yet 11 weeks on it still hasn’t happened. Today I get an email telling my payment is changing from 100 to 200 a month purely because my account hasn’t been updated. Email complaints are falling on deaf ears.
No response at all.

Email complaints are falling on deaf ears. No response at all.

If you haven’t done so already I would highly suggest you follow the advice in this article: https://help.bulb.co.uk/hc/en-us/articles/115001228431-Making-a-complaint