Why do I need more expensive internet when I want 6 streams and 1tb dvr

Unbeliveable! Two reps i went thru who they just told me I cant get the larger uverse dvr or 6 streams because I would need 1gig speed. Im already on 300m fiber plan and the support article regarding 1tb dvr and 6 hd streams make no mention of a min internet package. The only requirement is to be in a ATT fiber service area (im pretty sure that internet is not even required for this upgrade). Please have your call center staff trained on this