Impossible to get help

I recently lost my phone so I decided to upgrade my data only contact to a cellphone contract rather than buying a new handset or cancelling the old one(cheaper). Problem being that I had registered my old phone number for EaziRecharge, and you can only have one number linked to a card number. I have searched all over for how to change the number registered to a card but had no luck. So I decided to contact the call centre for assistance. After around 15 attempts to get a hold of a consultant for assistance, and contantly being cut off after 15 or so minutes of waiting I am running out of patience. I have been served well thus far but this is becoming pathetic.