The UK customer service telephone contact number for Facebook is +44 20 8002 8790. This number can be used for technical support or to speak to the team about a breach of security or confidentiality.
Facebook account holders can also contact facebook on the number +44 20 8002 8790 if they are locked out of their account. The customer service team will do all they can to help your reactivate your account. Similarly you can phone the team if your main account has been deactivated in error. Facebook users can also phone +44 20 8002 8790 to report suspicious activity on their account, or to make a complaint.