Received a text to call urgently. I called and got...

Received a text to call urgently. I called and got told I had a $30 debt that had to be paid immediately or it would go up to $180. I said okay I'll pay, to which she replied and said 'it says here it's already been paid'. No idea why I received a text message 30 minutes beforehand!? Ridiculous, confusing and unprofessional.