Patience and an auger will solve most bad blockages. If the water level is rising on its own, evacuate the bathroom and call a plumber – you have a sewer line issue.
The horror! The indignity! The mess!
If you have tried heat, pressure, and snaking without success, it is time to call a plumber. This usually indicates the blockage is deep in the main sewer line, possibly caused by tree roots or a collapsed pipe. how to unblock a badly blocked toilet