Unresolved Billing Issues

I paid $291 from January 2025 to August 2025. On my August 2025 statement it says I will no longer receive a service discount of $29 starting September 16 2025. I called on September 14 2025 to change my plan to avoid being charged the extra $29 service discount set to expire in two days. I got locked into a new plan for $294 on September 14, 2025 after speaking to the loyalty department. I was told that my bill due in October would be $321 (which I ended up paying) because it had already been “printed”. However, I was promised by your loyalty department that for November’s bill, instead of paying $294, I would be charged $29 less and pay $265. Then come December, my bill would go back to the $294 for the next 5 years. A few days go by and I get a new statement and the bill says $850. I call and am told it’s an error, notes are made on my account, it will all be corrected within 24-48 hours. I wait 96 hours and it still says $850. I call again on October 20th, I’m told this time that my plan change on September 14th never processed. Was told that it will get processed now and my bill will be $265 in November and $295 in December. Was told to wait 24-48 hours. I wait 72 hours, bill still says $850. I call again on October 24th, I’m told my tickets were resolved, my bill was reviewed and everything is correct. But this time I’m told my bill will be $326 for November then $295 for December. Once again this is incorrect. Jennifer from loyalty department speaks to her supervisor and states it’s correct, I owe $326. I now wasted 5+ hours trying to get this resolved and have gotten no where. I don’t understand where the ball was dropped and how my bill became $850. What I’m asking for is what I was promised on September 14, 2025. My bill due in November be $265, then moving forward for the next 5 years my bill will be $294.