It can be hard to get your complaint heard, and even harder to get it resolved. Below, we have explained everything you need to know to effectively complain to SSE, including the relevant addresses and social media pages.
SSE's customer service team is on 0345 026 2658.
If, after initial contact, the complaint has still not been resolved, email headofcustomerserviceteam@sse.com. Alternatively, you can write to PO Box 7506, Perth PH1 3QR.
It used to be worthwhile sending a letter to the CEO marked "private and confidential", but this isn't as effective as it used to be now that so many people use it.
Complaining on social media can be effective. On Twitter, SSE can be found at @SSE or @YourSSE – copy @MoneyTelegraph into your tweets so we are aware of your issue.
You can also complain on SSE's Facebook page.
If your complaint hasn't been resolved in eight weeks, then you can make a formal complaint to the energy ombudsman service.
This is a free, impartial service for energy consumers. It will investigate customer complaints and its decision is binding, so SSE would have to pay up if it found in the customer's favour.
Call: 0330 440 1624 or write to Ombudsman Services: Energy, PO Box 966, Warrington WA4 9DF.