Make sure you follow these simple rules:
1. Reject any unsolicited calls, emails, text messages or visitors to your door. Legitimate companies will not cold call or contact you out of the blue.
2. Check the FCA register of regulated companies, or the FCA warning list.
3. If you're thinking about getting help with your pension, seek independent financial advice from an FCA regulated firm.
The FCA also has a page dedicated to helping you identify a pension scam. You can visit their website to access https://www.fca.org.uk/scamsmart/how-avoid-pension-scams
The Pensions Regulator also has lots of useful information to help you avoid being caught out.