Added a 2nd mobile line with the promise that my bill would be lowered

I have a case open for investigation regarding returning a mobile phone that I signed up  for under  false pretenses. I  used their chat and the agent basically lied and got me into adding a second line with the understanding that it would lower my overall internet/landline/cable bill. I had initially chatted hoping to see if the agent could find me a deal as i do every 2 years. My mistake was using their chat vs just calling. When I got my fist bill, the amount was not what I had agreed to and I am now being charged for a mobile line I did not need or want, and still paying the same high amount for the same plan . When I called, they informed me there was no new contract in their system, all they could see was that I added a mobile line.crazy!  I immediately had them escalate it for an investigation. I have screenshots of the convo in which the new price was agreed to. I also told the agent  I didn’t need the phone and I wouldn’t be using it, but if dropped my bill to $150 from 230 a month, no brainer. Come to find out it was all really too good to be true.  It was a lie! They had me approve the new contact over chat..only to find out it was only for the mobile line and not the new 2 year plan to lower my overall bill. All I know is I better get a refund for the extra mobile line I am being charged this month as well as the 13 dollars they had me pay upfront to initiate the new line. Currently looking into moving my business elsewhere.