Demanding SMS

Last year i received a letter from Nedbank demanding me to make payments to my home loan specifying that my payments is delayed, i contacted Nedbank and they apologized and said they will fix the matter. <br> <br> Today i got an sms stating that i need to make payments/ immediate payment. And i some time to time receive demanding SMS.<br> I tried to contact Nedbank to check where exactly is my account going wrong , the lady from Contact Center failed to help.<br> The SMS/letter of demands irritates me and i would like to see problem solved, i do not remember skipping payments. kindly help.<br>