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Unfortunately, by running the pump for so long without it shutting down you have now damaged the pump. Most likely the impeller has cavitated. Pump cavitation occurs when a pump continuously runs and builds heat and pressure without relief, cavitation creates bubbles in which cause damage to the internal pump. You will need to rebuild the pump or replace the pump at this point.
I cannot speak for the pressure switch company and they will typically only replace their product. as for the pump, rebuild the impeller as this is the best and cheapest option at this point. As for the time frame, I cannot confirm due to any specific time however in typical cases it is very possible this is your problem and that was the cause of it!