Trade-in offer costed me more?

Aware this is from a while ago, but hopefully I can shed some clarity on what is happening and maybe help someone else in a similar situation based on an almost identical promo deal I did, and I had the same confused response to my bill at first.

Had you not traded in anything, the Iphone 12 would have been $830.00 or $34.58 over 24 months. 

You trade in an Iphone 11 and will receive $830 credit, but let me explain how that happens

1. Your account bill is first set-up as if you did not trade anything in (since the credits show as a negative subtraction). So after the trade, your monthly bill will show as the full purchase price financed over 24 mo, which is $34.58  
2. You receive a one time credit of $205, which pays for your TOTAL phone bill for a couple of months. You are still owed $625 in credit ($830 - $205).
3. The $625 in credit still owed is divided by 24 months, equalling $26.04 monthly credit.  
4. This $26.04 is subtracted each month from your bill in the form of a credit, which leaves a balance of $8.54 every month ($34.58 - $26.04).

The $8.54 you pay for 24 months is the same as if you had not received the first $205 credit and had instead had the full $830 spread over 24 months… ($8.54 x 24months = $205) 

You are still receiving the full $830, it is just being paid as one partial payment and then the rest spread out. If you were not paying the $8.54 every then you actually would be receiving a total credit amount of $1,035 because ($34.58 x 24 mo. + $205 first credit = $1,035)

I hope this helps! Really wish they made all of this clearer because it also took me a while to figure out if I was getting scammed or not lol