Air Internet Poor Quality and terrible Connectivity

I just recently hooked up my new account All Fi box with extender let me tell you its definitely not worth the $70 a month I cannot watch a live sporting event with out blurred and constant buffering going on a week or so in this billing cycle and have not been able to make it through a 30 minute tv show without being frustrated and over charged. At&T has a great reputation and in my area I don't have any fiber or options other than air. I cannot connect more than 2 things to the all fi and the extender is just junk. Any ideas on how to make this better. I thought it was better than my verizon now I have two wireless internet bills cause at&t is unreliable