T mobile offer not honored

Unfortunately I don't think they explained things correctly and that's why there's confusion. As a sprint customer you technically already are a TMobile customer and do not qualify for the new account deals. I understand you received the mailer and I know how that happened. When eligibility is determined for those mailers it's based off a system check of if your info is in the database. Being you are on a business plan, there's different credentials attached to those (FEIN instead of SSN) hence why you got a mailer because they didn't see you as a current customer based on 55+ being only available on personal accounts with a SSN. Systematically you can be migrated from Sprint to TMobile it keeps the same account type and since it was a business account, it migrates to the same. Then a change of ownership/responsibility would need to be completed to move it to a personal account.