I need extreme help

Earlier this year, I wrote a review about my experience with Telkom and the ********** upgrade that was done on my account, that was sorted and they credited my Telkom account with an amount of R 6,964.49 in June, I then asked for this amount to be credited in my own bank account because they were deducting on it so they told me that as per Telkom policy they only credit the amount on the existing contract account that I have and not on my bank account, they said R350 will be deducted on the credited amount until the credited amount is R0.0 then they will call me to arrange a debit on my bank account. So to my surprise, I received a statement saying that I owe Telkom an amount of R 1,678.70.....like how? because no one called me regarding this and I have not been using the new Telkom number for a while, I am not sure where that money comes from and no one from Telkom called to advise of what is happening. I really need help because I have a lot on my plate, I had a miscarriage and I am really not coping and now Telkom is adding too much stress on me and I really do not know how to deal with it.