Receiving SMS reminders when account is up to date

On two occasions I have received an SMS telling me that I am behind in my payments when the account has been paid on time every month. The first time I contacted the branch to be told it was not their responsibility but that of the call center. They put a note on the account cautioning the call center not to send reminders on accounts paid up to date. Despite this I received another reminder! I was told by the branch to email the call center which I did, but have received no telephone call, in spite of their promise to phone me within 72 working hours. I question what is the point of sending out SMS's if you are sending them to people who have already paid?