UN-BLACKLISTING UN-RESOLVED AFTER NUMEROUS ATTEMPS

My Mobile Phone Samsung S4 Mini (S/N RF1F50S0Q4A) was lost and then found after I had it blaclisted. I asked Kadsons Communications in Lydenburg Mpumalanga to have it un-blacklisted on the 8/12/2015. SR created on 18/12/2015. Ref No.S3-90I3J-J2WZ2. After numerous communications Head Office reported that the device was un-blacklisted imei nr. (***) without success. The device was even sent in to have it checked for damage to the sim reader but returned back okay! I would like to know where the buck stops - surely this is not rocket science!