Mint Mobile complaint: Denied Refund Claim

I renewed a 12-month subscription for cell phone service with Mint Mobile on 01/16/2023 (1 day before the expiration on 01/17/2023). I renewed on Mint Mobile’s website and the new 12-month subscription fee was charged to my American Express credit card which was the card Mint Mobile had on file for me. I called to ask if they would reverse this so I could charge the subscription to my Chase visa card. They agreed. I charged the subscription to my Chase card using Mint Mobile’s phone line on 01/16/2023. On 01/18/2023 I discovered my subscription hadn’t been charged to the Chase card on 01/16/2023 like I thought so this time I went online to renew. On 01/24/2023 I called Mint Mobile to cancel because I decided to go with a new cell phone carrier (Tello). I cancelled within Mint Mobile’s 7-day refund time frame (01/18/2023 to 01/24/2023) and was expecting a full refund. Mint Mobile denied my refund request and expects me to pay 100% of the 12-month renewal fee even though they haven’t been my cell phone carrier since 01/24/2023 and they haven’t provided any service to my cell phone since 01/24/2023.