Hounding me for payment

On Saturday 12 December I did an upgrade in the store. My husband asked Mishkah what fees need to be paid upfront. She advised no Fess need to be paid and I would just be billed prorata for the package and pay the device fee at the end of January. <br> Since then I've received a call on Sunday saying I have to come in to store to pay R150 fee for upgrading or else my line will be cut.<br> When calling contact centre they advised I don't need to pay a fee and that I am up to date. I called back to the store and spoke to Sharne who advised the line would not be cut and that maybe Mishkah forgot about the fee I needed to pay. I told her that this is no fault of my own and where should I find time to come back into the store.<br> I received another call today which I missed and a voicemail was left by Mishkah again saying that this payment is overdue and I have to come in to make the payment. I am absolutely livid because I specifically asked what I need to pay in store.