Telkom

I have taken a contract with telkom for cellphones the agreement was that they will debit my account every month.everything was going well just the past few months they claim that they don't find money in my account and now they charging me double for the past two months and this month again.this month they send end me an email claiming that they is no money in account..then they said that I must do an EFT I waited for detail as today they decided to charge me double..am not going to renew my contract they are just ******* seeing that the contract is coming to the end the charging me double.