Silverado ac problem

[RR1999]

So I’ve just recently fixed the ac in my 2003 Silverado, needed a tensioner, belt and recharge, after everything was done I pushed the ac button and it still blew hot air, then I noticed when I shut the ac off the compressed turns on, and when the ac is “on” the compressor is off, so the ac works but it’s opposite, ac on is really heat on and when the ac is “off” it’s on, anyone know why? By the way it’s all button controls with the display screen for the climate settings