Exorbitant Promo Service Fee not indicated

Good morning I renewed my MTN contract on 23/03/2018 I stressed REPEATEDLY to the consultant that I was not able to afford anything more than I had paid on my previous contract (MTNCHOICE100M SUBS FEE of R 127.19 and PROMO SERVICE R FEE R64.91) - total usually about R 350.00 To my horror I received my first bill of R 1 06943 under the new contract with a PROMO SERVICE FFEE of R 658.77 and My MTNChoice Talk +S of R 218.42 I am desperate as I had to borrow money to make sure the debit order would be met I still have the new phone in its sealed box - unopened I feel totally disillusioned as I believed that the consultant had heard me as my resources are extremely limited I have had a contract at MTN since 1997 and this is the first time something like has ever happened I have emailed MTN customer service but have heard nothing