Have you tried calling all four of the numbers posted above?
If you only bought a goodybag, your balance will be £0.00. Goodybags and [airtime] balance are different things.
Please dial 43430, option 2. Listen to the message, then answer these questions:
Could you please test dial the 4 numbers I've given you, and tell me exactly what happens for each number and dial 43430 and get the information I requested.