I need to lower my bill.

I started off paying $120 for a 2 year contract and since then I've been paying $303 a month. I tried calling to get it lowered and I actually got someone to get me a lower bill than my original price, but when the bill came it was $303. I called back after that and complained again and spoke with someone who said that they couldn't find any information that I was told a lower price. I like ATT Uverse and don't really want to go to another company. Has anybody had any luck with getting their bill lowered?