STANDARD BANK MOBILE ???

I have been banking with Standard Bank since 2015/16, I haven't had any problems with the bank since the day I joined until now. I was contacted by a very money hungry saleswoman working with the Standard Bank Mobile department. She had offered me a sim and I was interested in the package, however I made it clear to the saleswoman that I'm out of a job and won't be able to afford the package right now, her words were, " you don't have to pay now, you will only be billed once the sim has been activated ", the sim has not been used since the day it got delivered and yet I've been billed for the past 3 month's, I even got billed twice in July, I would like a full refund as I have not used your services. I have logged a complaint already however I haven't recieved any feedback.