Disable Business Modem Hotspot

I am sick of this being on with no way to turn it off. I regularly have groups of transients hanging around my business and harassing my customers for money while apparently logging on to the public WiFi with their smart phones.... seriously???. If I turn off the modem they scatter fairly quickly. So it's pretty obvious that this is the case. I want this turned off and I expect it to stay off. I am losing business and now online reviews are even giving my business poor reviews due to the transients hanging around and causing problems.