Unhappy Customer

I am so frustrated at the service I get from Telkom Mobile.They are debiting me every second month and sending me messages that my account is on arrears.So I have logged a call for a call back.They called back,I told them to put me back on a month to month payment ,changed my debit date before the date .On Friday I got debited,On Sunday they temporarily blocked my accounts and today they send me a message that I am in arrears when I clearly got debited on Friday.I logged for a call back like about four times,because I am unable to call out,I have logged for a call back about three times now and haven't been called back at all.