False Promises for Rates

I like many others are getting scammed by Xfinity and their representatives. I have seen countless posts of others having the same issues as me. What kind of [Edited: "Language"] business model are you running where you would rather [Edited: "Language"] your customers for an extra $30 a month than having them stay happy and loyal with you for multiple years to come.
I was previously paying $110.58 for my internet for about a year then my rate went up by $30, I contacted a representative and told him the issue. I was told the promotion deal I had was over but that he would help reestablished it to its original price. We were on the phone for over half an hour and I asked multiple times if it would be reduced to which he confirmed it. A month later and I'm still being charged the same rate as last month that I called to dispute about. I call again to dispute this again and I get the bad luck of getting a woman who said that's too bad and I should go find someone else for internet. Really ? This is how you treat your customers , you just have one representative disrespect them and another  lie to them? Your calls are "supposedly monitored" and so are mine so that we can both fact check that I was promised a rate change and then not have it delivered.
I just want to continue with Xfinity with what I was originally paying , if not , then I suppose I will have to find another company that won't insult me for an extra $30 a month. Thanks