Extremely Disillusioned Customer

I have using my Diners Club card for a number of years now until recently. I am now continuously getting SMS' from Diners Club advising that my account is in arrears. I duly contacted their Credit and Rehabilitation Call Centre who advised that my account was in arrears for a measly R38.00. After an unsatisfactory conversation with the agent I paid an amount of R150.00 for my own sanity and thinking that these SMS's would cease. Needless to say these SMS's have not stopped. Today I contact the call center who advised that my account is actually in credit but they could not confirm that these "harassing SMS'" would stop. So the question I would like to put forward to Diners Club is this: Is this the Diners Club experience they would like their members to have and is this the way they plan to retain faithful paying customers going forward? Needless to say that I am extremely disappointed with the service received after being a keen advocate of this product for many years. This experience has left me extremely disillusioned about the product and service received.