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what program are you trying to use ?
Is this for skype maybe ?
so who did you buy the credits from
We are not skype. Skype has about zero tech support.
If you want my help i will be happy to help you but if you think that you don't want to pay for it than i can get you a refund and you can try to deal with skype directly
How long ago did you buy the credit ? skype credits expire sometimes and you have to log into the skype website and re activate it there.
Have you tried logging in to the skype website through a computer browser and checking your account there ?
i put you in for a refund from here. You can deal with skype directly.