A member for the Forum Team should pick this up for you, however it can take from a few days to a week.
You could try the text messaging service. Just send a text with a short description of change contact number to 07533 051809. Your message will go into a queue and a representative will respond to you as soon as possible. It may take a few days.
You can also call 150 from a Virgin landline/mobile , or 0345 454 1111,butbest to call at 8am to avoid call queues
The Service you do for others is the rent you pay for your room here on Earth - Muhammad Ali