Phone lock

Good day African MOBILE I have a problem where i paid my sons phone but its still locked and no one calls me to update me or anything i went on your WHATSAPP Plat form but no assistance i will publish you on the NEWS PAPER IF IT DONT GET A CALL IN AN HOUR What must i do with a phone that is locked with no assistance from your USELESS Company MY CONTACT NUMBER : *** Please call me back NOW