Mtn sp debit order that I never authorised

I m very unhappy.theee was a guy that called named himself sihle.he said he was calling from mtn regarding a laptop that I app**** for and I did actually was waiting for mtn to come back to me regarding the laptop deals that they have.the guy requested an mtn number from me that I don't even have my wife is the one that has an mtn number.so I realised mtn was trying to debit my account and my bank wouldn't allow.i poped in an mtn shop and I was then told I was given a data deal contract and really I did not apply for it neither did I authorise for mtn to debit.i called mtn several times to cancel this and they promised they will cancel.i m surprised that I have a debit order that just ran of r175 .mtn agents must stop pushing *****ulent sales.please some one cancel this nonsense.my name is sifiso Mhlophe cell number ***.very very unhappy.you guys are going to ruin my credit profile.Mtn cancel this **** immediately