ANDREA , i had similar problems once upon a time with my 02 sim card and calling their customer services is IMO a waste of time. I would recommend you registered the sim card on the website, if you need an address use this one
7 barby road
rugby
warwickshire
CV225DU
And then email customer services , which i have found to be really great, much better than phone based support :ranting2: !
If not you can send a message to activate the option to 21300
good luck
//damn didnt read carefully enough!!! then your only option is to use the website to email them