I know this is frustrating, but you have been told where. Claro provides the warranty service for iphone in Argentina.
"Service and support for your iPhone is available through your carrier. Select your country below:
Personal
Claro
Movistar:"
http://www.apple.com/lae/support/iphone/
"How can I tell if my iPhone needs service?
Visit our iPhone support site for helpful troubleshooting information. If you have reviewed the articles on the website and you're still not sure whether your iPhone requires service you can contact your carrier."
"How do I get my iPhone serviced?
You can bring your iPhone to your carrier."
"How long will my iPhone service take?
For details regarding how long your iPhone service will take, please contact your carrier."
"How do I check the status of my iPhone service request?
For service status, please contact your carrier.":
"What are my service options?
Please contact your carrier for service options.
"
http://www.apple.com/lae/support/iphone/service/faq/
I don't know why Claro is telling you that Apple is the problem. It is Claro's responsibility to handle this for you.