T-Mobile Wireless withholding credit balances Nationwide

We had a couple of T-Mobile's "Pay-As-You-Go" Legacy accounts,... no contract, no statements.  A few days ago, we contracted with AT&T Wireless, and AT&T performed a routine deactivation/cancellation of our T-Mobile service so we could port our existing numbers to AT&T. We called T-Mobile's billing dept. the next day to check on our account credit balances ($100+), and were informed they we would forfeit any credits due our cancellation. The only alternative we were offered was to assign the credit to another T-Mobile customer.

This is common THIEVERY,... its our funds, not theirs! Apparently, T-Mobile thinks its customers are just captives, and subject to their internal rules. We signed no contract, and expected a refund of our credit balances, just as we would have from any legitimate business. We've filed complaints with the California Public Utilities Commission and the FCC.