Self installation Question

I recently signed up for AT&T internet, and I chose the 'AT&T Internet 18' plan. I just found out that there will be a $100 installation fee. However, when I called back to try to change my service to self installation, they told me I wasn't able to do that for this internet plan. That seems ridiculous to me, considering that the previous tenant used AT&T internet in my apartment, and it is already wired for them. Does anybody have any experience in getting them to let me install it myself? Thanks.