DOUBLE HANDSET BILLING

I'VE BEEN BILLED FOR 2 HANDSETS DUE TO AN EARLY UPGRADE. FIRSTLY, THIS WAS NOT COMMUNICATED TO ME WHEN DOING THE UPGRADE (AND I HAD AN EARLY UPGRADE 2 YEARS AGO AS WELL). THEN VUSI WHO HANDLED MY CURRENT UPGRADE INFORMED ME CLEARLY (PHONE CALL RECORDED), THAT I SHOULD ONLY BE CHARGED FOR AN OVERLAP OF THE 2 HANDSETS THE FIRST MONTH OF MY BILLING DUE TO THE CHANGE-OVER, FAIR. I THEN STILL GET CHARGED THE 2ND MONTH FOR BOTH HANDSETS. I CALL THE CUSTOMER CARE AND NOW STORY HAS SUDDENLY CHANGED THAT DUE TO THE EARLY UPGRADE THEY WILL BE CHARGING ME FOR BOTH HANDSETS UNTIL NEW CONTRACT OFFICIALLY STARTS. SORRY, BUT THIS WAS NOT COMMUNICATED TO ME AND I REFUSE TO PAY FOR 2 HANDSETS OF WHICH I'M ONLY USING ONE, AND BENEFITING FROM THE BENEFITS (AIRTIME, DATA, ETC) OF ONLY ONE! THE LATEST IS THAT THEY'LL CHECK MY RECORDINGS AND REVERT BACK TO ME IN 24HRS. WE'RE GOING ON TO 48HRS AND NO FEEDBACK. I HAVE BEEN PHONING SINCE 22 APRIL, AND FOLLOWING UP AT LEAST 4 TIMES.