A/C Will Not Turn Off

I just bought a 97 Dx corolla. When I bought it the a/c was off, I turned the switch on and left it on. After buying it, I tried to turn the A/C off and nothing works except for taking the relay out. When I do this this the cabin switch stays green. If I unplug the switch within the cabin, the compressor still remains on. I can't figure out what is going on. Please help.