I was LIED to TWICE by the Xfinity agents

Very frustrated here.

I am currently paying the $25 per month for the 400mbps but my promotion is ending which is why I reached out. 

I was talking to an agent about my situation and they said if I "upgraded" to the 600mbps, I can have the price of $41 for the first month, ($20 additional discount off $61 for my current 400 mbps plan which already had the $20 automatic loyalty credit).

While that "upgrade" happened, my internet disconnects and of course, the agent disappears. Next thing I know, I see in my account that my total expected charge is $88! Way higher than I had stayed with my current plan. So I talk to a different agent and they said they would apply a promo and I can pay $25 per month for the whole year. I was of course suspicious, but they confirmed it. When I asked the agent more about why they were allowed to do this deal and not the other agents, they disappeared and redirected me to another agent. Of course, my account has yet to be updated. Very upset that the agents are lying back to back.