Boiler won’t shut off despite reaching desired thermostat temperature

Hi everyone,

My knowledge about my one pipe boiler and steam system is minimal. I recently had a gas fireplace installed, in the process the workers installing the gas line from piping that goes to my furnace accidentally caused a disjoint in the thermostat wiring to the wire that goes to the furnace. I reattached the wiring but since then my furnace will not shut off when it reaches the desired temperature on thermostat or even when I turn thermostat to “off.” I assumed I re-attached the wires incorrectly and have tried several different combinations with the same result. The wire to the furnace has a red and white, the wire from thermostat has two whites. I feel like I have tried every possible attachment combination (maybe not?). Is it possible the wiring or unit are just bad or short circuited to due the tampering? The thermostat and wiring are very old. I am thinking the easiest solution may be to just have new wiring and unit replaced altogether, but my hunch is it may be a very simple fix? I appreciate any advice or help.

Thank you,
Ryan