Sprint Lease to T-Mobile Agreement

Same happened to me. Had the Sprint Flex Lease Deal on 2 samsung devices totalling $108 per month. We upgraded our phones and the lease option was no longer available so we switched to paying off two new devices. We returned the old devices to Sprint when the new devices were shipped to us. I have just discovered that we have still been paying a $108 lease charge per month for the last 24 months. I contacted T-Mobile asking for a full refund of the lease charges and they only provided a credit for 2 months lease payments against our current bill. They have essentially taken $2592 from us for ZERO value or service returned and refunded us just $216 of what should be owed. The told me that they opened an investigation and concluded that I should have put in a manual request to can the lease payments. If I want to take this further, they gave me a mailing address for their legal dept in WA.