Need a plumber to unblock a toilet in my apartment

Hi, I’m looking for a reliable person to unblock a toilet in my apartment. It seems blocked and I’ve tried plunger and a basic chemical unblocker with no success. The job is in a two-bedroom flat on the ground floor, and I’d prefer a pragmatic, safe approach to identify the cause and clear the blockage without causing any damage. Please bring basic tools, check for any flow issues, and advise if further action is needed. Availability during the afternoon would be great.