Poor business practices

3rd contract with Telkom. All of a sudden my account gets locked due to credit limit thats not applicable to my account. Gets unblocked eventually. Now they deducted double the actual installment in one go. All this because their system took my upgrade as an early upgrade. My wife renewed her contract as well, same phone, same contract, same day, but her contract is pulling through normal, no account blocks, normal payment deducted.