As per further checking of your account, we could see here that you recently joined to employee discount here in T-Mobile that called Work Perks. That's why the bill cycle changes happens. The Company is requiring the account to be aligned with the Company node. I hope this clear things out.
The $207 was just a total including the prorated charge. This change happened only because system aligned your account to the company node as they already require this to all of their employees. There was a bill generated for the cycle 8/15 - 9/14. Because of this change, there was a prorated bill generated for the date 9/15 - 9/24. Now the regular bill is generated for the cycle with the correct node dated 9/25 - 10/24.