LOST MY NEW CELLPHONE

GOT NEW CELL ON 11/03/2015, TOOK IT BACK TO LOCAL BRANCH THE MORNING OF 26/03/2015, THEY RETURNED IT TO THEIR HEAD OFFICE. I FOLLOWED UP AFTER HEARING NOTHING AND WAS INFORMED BY THEM THAT ON THEIR LOG IS A NOTE MADE THAT ACCESSORY MISSING AND ALSO AGAIN ACCESSORY FOUND. THEY SENT IT TO THE REPAIR CENTRE. I THEN AGAIN FOLLOWED UP AND WAS TOLD THAT MY PHONE WAS RETURNED TO LOCAL BRANCH. GOT THERE AND SAW THAT THE PHONE THEY WANT TO GIVE ME WAS DAMAGED AND DIRTY, THE IMEI NUMBER ALSO WAS NOT THE SAME AS MY ORIGINAL PHONE. I TOLD THEM THAT IT WAS NOT MY PHONE, THE REPAIR CENTRE CONFIRMED THAT THE DAMAGED PHONE WAS THE ONE THAT THEY RECEIVED FROM AUTOPAGE. THEY ARE SAYING THAT IT IS MY PHONE, EVEN AFTER THE LOG LOADED ON THEIR SYSTEM STATES THEY LOST MINE. NOW THEY KEEP ON SENDING ME USED, DAMAGED PHONES & WANT ME TO PAY FOR THE REPAIRS. I AM PAYING R160 / MONTH FOR A NEW PHONE WHICH I HAD FOR 14 DAYS. THEY REFUSE TO GIVE ME A NEW PHONE EVEN IF THEY LOST MINE. THEY REFUSE TO RECTIFY THEIR MISTAKE. I WAS PATIENT FOR A LONG TIME AND REFUSE TO WAIT ANY LONGER AND WANT WHAT I AM PAYING FOR, I ALSO WANT THE MONEY DEDUCTED BY THEM FOR THE PHONE I DID NOT HAVE TO BE RETURNED TO ME. ASAP!!!!