DEBIT ORDER INCORRECT

Good Day,

To who it may concern my account has been debited without my consent of an amount I'm not aware of, My account had been settled from all arrears in July. At the end of August I get an invoice of a totally different amount, upon calling Telkom and emailing my bank statement I received a statement for September of nothing to pay, I said to myself I will still pay the amount needed, In October I delivered my baby, and still my accounts before my debit order dates, Today my account gets debited with the last monies I have to buy my child's formula and diapers for the month. Is this How a single mother and child needs to be left stranded before Christmas? Is this how irresponsible companies can be ? Upon calling the agents of Telkom I get told that there's noise in the background and their headphones are soft how is it my problem ? Sitting with anger and frustration on how do I do my things to provide for my child . I need urgent assistance with this.