Did you receive a text confirming a changeover date?
If not, submit the form again or call O2.
Advice from an O2 Guru regarding a way to get through:
If you call 202, when it comes to the reason you are calling stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
2 working days is normal.
Did you get a text to your number you are keeping to confirm?