xfinity billing

I'm a senior on a fixed income so last month I called up xfinity with help lowering my bill. The agent was super helpful and worked with me to change me to  another package and also gave a 6 month discount credit. 

I received an order confirmation dated 2/18 for updated services for Internet/TV & Voice totaling $158.56

My first adjusted bill was $168.55

My upcoming bill is showing $194.18

I reached out to the 1-800 support and have been literally ARGUING with the representative about what was offered to me and what I agreed to. I explained to her the order confirmation I received and now they are saying that was for one month.

That's incorrect - this is a monthly service, changes applied are to be ongoing. I am so upset right now that I have spent at least 2 hours on the phone trying to resolve this and being told that I'm wrong, or I'm confused, or that I misunderstood the last representative. 

I know exactly what I agreed to and the order confirmation in writing verifies that. I've even attached it below: 

I need someone to resolve this now before the next auto-pay posts or I will be forced to cancel this service because it is out of my budget.