They will not take no for an answer !

I am working min wage and in college and they charge me 30 dollars unasked for a month. I didnt even sign up. An old landlord signed me up for it when I was applying for apartments...I called to cancel and he kept trying to sell me cheaper versions until I finally had to get more assertive and say I told you NO and I just want to cancel. I understand they have a job to do but good lord.. After 5 minutes of straight up refusal of my request he canceled it. If you have this situation, keep the cancelation number they give you because I am not going to be shocked if I see the charge next month anyways. So annoying!