Locked account with no reason

Locked my account even though the payment date did not pass. I'm meant to pay on the last day of every month, my account was locked on the 27th now I will have to pay a late fee / unlock fee. When you lock accounts people can't call you to query or resolve, YOU need to call and communicate! TOBI does not work! Requesting a call back does not work! The automated payment call does not work, no sound when we answer the call! Half the time your VodaPay app doesn't work either! If you want to randomly lock people's accounts you need to make it possible for them to get in touch with you. I don't see why I should pay the penalty fee if the payment date had not even passed yet and I had no way of getting in touch with you!