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Hi victor122, welcome to the Community, and thank you for reaching out. I can definitely understand how frustrating this may be. These articles contain several troubleshooting steps you can try, including testing the camera in Safe Mode.
If these steps do not work, you can also try a factory reset. Perform a factory reset on your Galaxy phone
And don't forget to check to make sure there is no film over the camera. This sometimes gets missed. If this does not help, I recommend letting a service technician have a look. You can use the following link to find a list of service centers in the U.S. that can do the repair: http://www.samsung.com/us/support/service/location or by calling customer support at 1-800-726-7864. For service outside of the U.S., please use this link: https://www.samsung.com/us/common/visitlocationsite.html. I do apologize for any inconvenience.