Billing errors

I received a SMS from Woolworths Financial Services (from number ***) stating that my credit card was in excess and that failure to make payment would result in additional fees being charged. I logged on immediately to their mobile application and found that there are no arrears on my credit card. I service my account consistently. It is not the first time that I am harassed by Woolworths because of their billing system. I need Woolworths to contact me urgently and fix this problem.