PATHETIC SERVICE FROM MTN

I REQUESTED AN UPGRADE WITH MTN , I WAS TOLD MY UPGRDE WAS DONE AND MY PHONE WOULD BE DELIVERED TODAY. I PHONED MTN TO CHECK WHAT TIME MY PHONE WOULD BE DELIVERED AND I WAS INFORMED THAT NO UPGRADE WAS DONE ON THEIR SIDE. I SPOKE TO AND SHE TOLD ME THAT THERE'S NOTIHNG SHE CAN DO AND I CANT SPEAK TO A SUPERVISOR BECUASE SHE CANT DO MUCH EITHER, I INISISTED , WHEN SHE EVENTUALLY AGREED , SHE PUT ME ON HOLD FOR A GOOD 15 MIN WITHOUT GETTING BACK TO ME. I AM EXTREMLY LIVID AS EVRYTIME I PHONE MTN I SPEAK TO A DFFIRENT PERSON AND I HAVE TO REPLAY MY STORY ALL OVER AGAIN EACH TIME. I'VE BEEN TRYING TO UPGRADE FOR THE PAST 3 WEEKS AND IT HAS BEEN A STRESSFULL PROCESS. I WANNA CANCEL MY CONTRACT!!!!