Uptech Computer Scratched/damaged the computer screen when repairing the keyboard Birmingham Alabama

Took my son's computer there to have the keyboard repaired. When we opened it, it had a 1-2 inch scratch on the screen. At first the manager said they didn't touch the screen; but then later, he told me they took the screen on and off during the repair. They refuse to accept responsibility for the damage and refuse to fix it. The manager, Leon, won't give me his supervisor's name or contact info of their parent company so that I can file a complaint--very shady business practices and completely untrustworthy.