Wrongfully charged- did not signed up for contracts

Cellc i thought i had it going on, but damn did you surprise me! last year October they called and said i qualify for an early upgrade, signed up for it, now all of a sudden i have two contracts, where the hell did it go wrong, i did not signed up for 2 contracts, only 1 if you look at my history, how do you jump, from R199 per month to R712.00 tell me who has so much money laying around like this. please CELLC, i need you to up your game and hurry up with this investigation, then to top it off, they send you sms to say you are in arrears, please i did not **** this up, you did, i went from one store to the the next for them to tell me they are unable to switch my account from debit to cash, you cannot deduct monies i did not signed up for. if you want me to payup, change the details, investigate the matter and clear the persons name, i have all supporting documents to back me up, up to date i still have not received feedback from CELLC, they just send sms to say someone will call back, no one is calling back