When you paid the final payment did you changed all the info prior to it, including the phone verification? I think it can only be done if the seller had a phone number registered and after he received the final payment he reset his password through sms and then changed everything back.
Can you provide more proofs for your claim, like PM exchanged, Tx IDs, Signed message from the sending addresses etc.
yes mate i can give you all proof:
TXID and details:
BitCoin 1Hrdf4oVDNab66eH4Sx9LgGHixdjpaJnRN 0.60100000 BTC Yes 2015-05-10 15:47:40
Processed TrxID: 1196fa6899f250ea38ccbeb61da3318e377ec90f1910eca9a67f407d784d5951 @ 2015-05-10 15:52:38
BitCoin 1Hrdf4oVDNab66eH4Sx9LgGHixdjpaJnRN 0.60100000 BTC Yes 2015-05-10 15:23:09
Processed TrxID: 8f3cde73eb3584dba360ed072c2644ece098d9cba360b2484239100a8d555d76 @ 2015-05-10 15:26:38
and PM i will make a video and upload it or you need screen shots ?