One toilet with other fixtures draining normally is a different pattern from a tub rising when that toilet is flushed.
A single-fixture obstruction may be accessible through the toilet. Multiple affected fixtures can point farther downstream. A provider should explain what was found and cleared, especially when the clog recurs or the proposed next step is a camera or sewer repair.
Keep this boundary: Do not mix drain chemicals or keep adding water to a rising bowl. Tell the provider exactly what has already been introduced.