I purchased a Friday Deal of 300 minutes international add-on for $3 a few days ago. When I made a phone call to the Philippines after a few hours, my credit balance of more than $19 was used up. I tried to call again a few times only to hear an automatic message saying I don't have enough credit to make the call.
Now I got a text from Vodafone saying my international minute add-on off 300 minutes is expiring in two days. But when I tried calling overseas I don't get connected due to what the network say "not enough credit to make the call".
My questions are: why did Vodafone used my credit balance instead of my add-on international minutes, and how come I am unable to use my international minute add-on?