CONTRACT BROKEN BY CELL C

I UPGRADED 2 CONTRACTS ON 19/06/2015. CURRENT CONTRACT MUST ONLY EXPIRE ON 07/08/2015. MY ACCUMULATED PHONE AIRTIME, DATA AND SMS ON BOTH CONTRACTS WAS ZERO'D EVEN THOUGH I WAS ASSURED BY UPGRADES THAT I WOULD KEEP ALL BALANCES AND EXISTING CONTRACT TILL 07/08/2015 !!! NUMEROUS CALLS TO CELL C AND HOURS SPENT ON THE PHONE TO CELL C HAVE TO DATE NOT BEEN ABLE TO RECTIFY THIS FAULT THAT THEY MADE AND I MUST BATTLE WITHOUT PHONE TIME BUT OF COURSE THEY WILL STILL COLLECT MY MONEY EVERY MONTH ??? I HAVE RECENTLY HAD TO HANDLE TWO EMERGENCY SITUATIONS WITHOUT A CELL PHONE FOR COMMUNICATION !!! CELL C HAVE BEEN INEFFECTIVE AND USELESS AND JUST ISSUE NEW CASE REF. NOS. AND ESCALATION REF. NOS. WHENEVER YOU PHONE THEM. I HQAVE BEEN A LOYAL PAYING CUSTOMER FOR TWO YEARS AND THIS IS THE WAY CELL C TREATS ME ???