downgrade within 30 days of activation

I just got Cox bronze bundle $99.99 / mt  which included an extra $9.99 for phone FCC fees monthly. When I called them after the first 10 days of service and wanted to downgrade to the Contour TV/Internet only for $89.99, I was told I was on a promotion price and if i downgraded, I would lose the promotion and the new price for just TV/Internet would be $164 / mt and not $89.99 / mt!!! I was so pissed as SALES lied to me and told when i got service that I had 30 days to downgrade/upgrade if I was not happy. Nobody told me I would lose my promotion bundle and have to pay extra. Now I am stuck with phone and HBO since I do not need it?? Has anyone else had this problem with Cox? I have read countless of issues and bad customer service with Cox but there is nobody else in Southern California I could use and I feel Cox is screwing with its new customers. Please help me if anyone feels I can do something here. Thanks!