Cannot purchase 2 services

I have been told I can keep my Uverse TV without having to have internet by a gentleman in customer service.   OK that is fine I want to retain that TV service.    But as soon as I ask if I can purchase internet SEPARATE as a second item not along with Uverse, I am told they are not compatible.   IF I can have the TV service WITHOUT internet, why can I not add INTERNET as a second item?    I am allowed to have a LAND LINE phone and a Cell Phone they are SEPARATE why can I not have TV and INTERNET as SEPARATE as well?    At this point it appears I have to stay with Uverse for TV and then get INTERNET from a totally different company.   Why does AT&T not want my business?