Why I can't make international calls? The option is already activated on my account and have the add

I have purchased the addon for international calls (Paid 5$ for the 500min to Colombia, although in my account only say that I have 100min) and already activated the option to make international calls on my account (The Slide is in OFF) but I've tried several times to call to Colombia and always receive the message that my plan doesn't have that option.
How Can I solve this? (And the fact that received 100min instead of 500min)


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