INCORRECT CONTRACT CHARGE

ON THE 16/01/2015 I DOWNGRADED MY INTERNET CONTRACT TO THE 24MTH MTN BROADBAND 1G UYO@R69, HOWEVER I KEEP GETTING CHARGED R129 PER MONTH. I WENT TO THE PAVILION STORE ON TWO OCCASIONS AND EACH TIME THEY TOOK A COPY OF MY CONTRACT AND PROMISED TO CALL ,HOWEVER I HEARD NOTHING AND STILL GOT CHARGED R129. THEN CALLED MTN AND SPOKE TO SOMEONE NAMED BHEKI NTEBE AND HE REQUESTED THAT I [Email Removed] A COPY OFTHE CONTRACT ON THE 15TH MAY, I THEN SENT A FOLLOW UP EMAIL ON THE 21 MAY AND HAVE HEARD NOTHING, IN THE INTERIM I AM STILL BEING CHARGED R129