incorrectly billed, upgrade issues

i have recently tried to upgrade my cell phone at one of the MTN stores and was told that i am owing monies to due to debit order returning. upon paying for the debit order and returning to the store, for see if i could now upgrade, i was told i owe a further R11-00 and could not upgrade. i then payed that outstanding amount and returned to the fordsburg store to get my upgraded phone. which they have now sold. upon calling 3 other MTN stores which their numbers just rang, i got through to the glen MT N, they advised me that i now have another balance owing on my account. i called the MTN call center and was told that there is a debit order of R 579, loaded to go off on the 16- 04 -2015 from a consultant named nonkosi Dlamini who is working for cosmonet lenasia. this debit order being loaded is without my consent in the first place as i do not even have an autopage cellular account. im not going to be debited for an amount that i do not know about. is this not *****???