Billing Dispute

My promotion expired in November and my bill went from $68 a month to $87 a month. I called and the agent said they would lower the plan to $60 a month and keep my same plan and give me a $27 credit. Next month I was charged $87.00 so I called again went through two agents and I was told I would be lowered to a $60 a month plan and keep the same unlimited plan I originally had. I was also told I would get a $50 dollar credit. Next month my bill went to $107 and at this point I was absolutely steaming. I was also told that I would get a email from Xfinity showing my $50 credit and that never happened. I called again this month and I was told that I was on a limited plan that’s why my bill was so high. I was definitely told that I would be on my same original plan, I would not have ever agreed to a limited plan. Last agent I talked to said my unlimited plan would be $60 a month and I would be credited $20. I’ve been lied to and can’t wait until Ziply gets there service completed. I am going to talk to the BBB and possibly our state district attorney.