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Blacklisted is completely different than "getting it unlocked" or what is referred to as the SIM Lock or Carrier lock.
Blacklisted means the device either has an outstanding balance due on it (loan) or has been registered as lost/stolen. There is no way to remove it from the "blacklist" only the original owner can do that.
If you are referring to the SIM lock only also that can only be requested by the original owner of the device as long as their account is in good standing with T-Mobile. However if the phone is blacklisted not even a third party unlock service will get the phone to work on any network.
If at all possible and hopefully you are in the Ebay buyer protection window and would encourage you to return the device for a refund.
Hey there! I'm sorry to hear that it sounds like your purchase wasn't advertised honestly. :/ stevetjr is definitely right to call out the difference between carrier-locked equipment and blacklisted equipment - is the phone you received locked to the T-Mobile network, or is the IMEI blocked?