Galaxy S6- can't forget WiFi network

I keep wifi turned on on my phone. Unfortunately the wifi at my office is set up in a way that I can't receive e-mail or texts while connected. And, for some reason it automatically connects every day. I have tried to go in and "forget" the network so it doesn't connect but that hasn't worked. Any comments or suggestions would be greatly appreciated!
I have a Samsung Galaxy S6
Thanks

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