Open a AMD Warranty Service Request if you believe your CPU is defective or needs to be checked Online from here: https://www.amd.com/en/support/kb/warranty-information/rma-form
No need to make a physical telephone call.
By the way, if you are calling a USA Number from Argentina you need to add special zone numbers before the 800 USA number to get through. Plus it will be expensive making a international call unless you have a plan that includes international calls.
