Disassociated Phone - Unable to Login to T-Life

T-Life is supposed to make your life easier. I had seven numbers with T-Mobile on one account. Now, I'm down to four phones on the same account. The problem is that when you move the primary number for the account to another provider, T-Mobile disassociates the number for all purposes. I can't manage the remaining four numbers on the account unless my number is associated with T-Mobile. T-Mobile continues taking payments for the account via automated withdrawals. But now, I can't view statements, phone activity, etc. All that would be required would be a simple workaround from a development perspective. T-Mobile authenticated my credentials and was kind enough to tell me there's nothing they can do. I don't want my kids to have admin rights on a multi-line account. Does the T-Life Development Team have a solution?