Device trade in credit promotion

I traded in 2 iPhone 7’s for a total credit of $800 towards the purchase of 2 iPhone 13 minis. The old devices were mailed in and received and I’ve gotten $60 total credit on them that went against my first month. I also got a buy one get one promotion on the account. I understand you can’t use both the trade-in and the buy one get one. I also understand it can take 1-2 bill cycles for the trade-in credit to start showing up.

My question is do I need to do anything to make sure I get the trade-in credit in place of the buy one get one promotion? The trade-in credit is a better deal for me and results in a lower monthly payment. r/Help