One address. Need 2 accounts. Only one coax cable.

I have internet only at my house.  I intend to get a room mate who will have her own internet and TV.

I was told I couldn't do it unless I had a separate address.  I went to the city, and got a "utility" address (the regular address plus the fraction "1/4")  I went to a LOT of trouble to do this because I was told by the XF rep that they could install the second line at that address.    Then, after I got this address, when I called in, one XF rep found the address and told me it would cost me $10,000 to drop a line.  Then he told me I could just have 2 accounts at one address, as long as only one had TV.  I'm fine with that, I don't need TV.  The room mate does.  Today I called in and get the following answers from 6 different reps: (1) We can't find your address, it doesn't exist,  (2) We can't service the address as ¼ we can only install at an address as ½ (3) We won't install a second account to an address that is listed as a single family unit  (4)  We can't install a second account if you only have one outlet, you have to hire an electrician to add an outlet  (5) Call "Hello Tech" at [Edited: "Personal Information"]  they are the only one that can put in a second line     I am beyond frustrated.  Please help.  BTW,   I am perfectly capable on installing a splitter on my cable, I don’t need to pay hundreds or thousands of dollars to hire someone to do that. I just need to know WHAT is required and what splitter to buy.  Currently the house has ONE line that runs into the home, and goes to my modem in the basement.   I can cut drywall,  I can wallfish.  I have skills.  What I don't have is the ability to get hold of someone at XF that can give me an answer, or tell me how to get a second account set up at this address.   I spent 3 hours on the phone today with XF, and got nowhere.