Account's department chaotic and useless

I took out a contract in April, agreed for my debit date to be on the 25th of each month same day as my salary. My first debit was on the 31st of May, 3rd of June telkom attempted to debit my account again and is now reflecting as unpaid. 25th of June they debited my account, 20 July my account was locked due to non-payment, 25 July I was not debited and when I phone the call centre I am advised that I have 2 outstanding invoices and 2 accounts linked to my cell phone number. I know telkom to be useless and do not understand how I took another contract with them when their account's department is always a mess. I need this sorted out.