Customer service chat is not resolving my billing issue. Can someone please help?

It seems so simple:  I bought a S23+ for $1000 (because it was during the free storage upgrade promo so the 512 GB was $1000, not $1120) and my receipt shows I paid $1000 and will have $41.66 monthly payments minus the $20.83 credit and even the contract they emailed me said my monthly payments would be $41.66 but I got charged $46.66 the first month and it still shows that is what my remaining payments will be on my account page.  Can someone please help me with this so I don't have to get my account adjusted every month for the next 22 months?