so we were having problems with a stripped wire that runs from the AC outside to the hvac inside so for a few days the ac did not work. We had someone come out and he ran a new wire but now the AC won't shut off unless we remove the thermostat from the wall. It's a vivint smart thermostat. Only 4 wires no c wire. When I look at the have wiring thought the guy did, he connected a C wire. Can anyone help? How am I supposed to fix that without spending more money.