Along with what Joleen said.....even if you are paying you can't split your cable connection more than twice and connect to the internet without a poor/no conection.
In order to make more sense of that....you can split cable more than twice and watch T.V. and such, but you can't use the cable that was already split more than twice for the internet, you need to take a cable wire that has been split less than twice.
According to Comcast.