Definitely Not Fried Chicken

Definitely Not Fried Chicken

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The hotline
Couldn't find anything specific about the hotline. Here is my question:
When can I turn it off? I have several shops running now and the stupid extra orders from the hotline are just getting on my nerves...
Do I still get the missions when I turn off the hotline? I'm a completionist, so I would like to do the missions until I have accomplished them all.