Business account blocked for a short payment of R154

Business account blocked for a short payment of R154 A loyal customer since 2006 and all of a sudden with no warning the account is suspended due to SHORT PAYMENT OF R154. Can you believe it This company is becoming a joke like many things in South Africa. If the large corporates that are making millions if not billions can carry on this way is where do individuals and SME's stand Its already been 18 hours since my initial contact with the call centre and im still awaiting feedback