I’m sorry to hear you're having trouble. I know that can be frustrating. Hopefully, we can get this resolved quickly
You can soft reset or force reboot it. Press and hold down the Power button and Volume Down button at the same time for 10-20 seconds or until it shows the Samsung logo. This will force reboot it. Check if it is working now.
Also, open Settings > Notifications and make sure the Do Not Disturb option is not enabled there.
Please let me know if that didn't work, so we can continue troubleshooting.
Note: This is not my final answer. I strive to provide Excellent service or 5-star service. If you feel you've received anything less or if you are not satisfied or if my solutions didn't work, please don't rate me bad or poor or ok as it will badly affect my job here. Instead of rating, please let me know by replying here and I will stay with you and try my best to help you until you are fully satisfied or the issue is resolved.
Also, if you get an offer for a secure remote for an additional amount, please ignore it as it is an automatic offer from this site and not applicable to this question.