you need to give the Virgin mobile team a call on 789 from another Virgin mobile if you have one or 0345 6000 789 from any other phone. Tell them what has happened and request a new SIM (A £5 replacement charge may apply).
You'll have to pay for postage: 99p standard or £2.99 for next day.
If you want to say thanks > click 'Kudos'. Answered your question? > click 'Mark as Helpful Answer' also.