No, Customer Care - 1747 will do. You might have to be patient and explain a few times though. I got through to some Asian call centre and the guy who answered couldn't understand what I was trying to explain to him. After 3 or 4 minutes of back and forth, he transferred me to someone else and thankfully the 2nd guy knew exactly what I was talking about. Got me sorted with data, minutes and texts straight away.
Just explain clearly that you are already on a plan and you just want data, minutes and texts to use while waiting for it to activate.
All done, I was given 1GB, 100 minutes and 100 texts to keep me going until activation!