I owed Telkom R1, 758 and I got an sms to pay I paid the amount then they proceed two amounts of 879 making up R1, 758

I owed Telkom R1, 758 and I got an sms to pay I paid the amount then they proceed two amounts of 879 making up R1, 758. I have trying to get hold of them to tell them to pay back the amount they processed but it doesn't take me to a person to speak to. I can't get hold of them for my query. What company kind of company is it that a customer can't get hold of them