African Bank - BAD SERVICE / CLIENT AGREEMENT

I have made an arrangement with African Bank to pay off the arrears amount, which they accepted. They informed me that there wont be any further steps taken if the payment is received monthly as agreed. Every month my account is paid on time, but yet still I'm receiving sms's that they did not received my payment AND even receiving sms's of another African Bank client informing them that he did not stick to his agreement and legal action will take place. On the 25th Sep I received a Legal Notice from African Bank informing me that they will proceed with legal steps!?? This is not the first time I'm having such BAD SERVICE from African Bank! It does not help to phone in because they cannot or let me say dont want to help you. I'm just furious because surely a Bank need to treat their clients with respect and contact them when they not receiving payments. This is not handled in a professional manner and I need this issue to be solved ASAP. If not this matter will be escalated to NCR / Onbudsman for further investigation. Because how can a Bank accept an payment agreement and then still the client receive legal messages??