Watch out for this scam to get you to ring Sierra Leone. Phone rings once and they want you to phone back, very large charges if you do.
Go into you account and set your spending cap to £0 Then you won't be able to make chargeable calls outside your allowance.
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Or only callback if it's an 01/02/03/07 number.
Caveat: I know some 07 number ranges are Guernsey/Jersey/other international, that's where Doctor Google comes in.. never hurts to check a number before calling it back.
Certainly never call an international number back, they're pretty easy to spot.
Thank you for the post and for raising the awareness for this.
As @japitts and @enlli have suggested, there are several precautions that you are able to take in order to avoid this yourself.
Please do let us know if we are able to assist you further.