bad company not following popi act

i receceived a threat massage from this unknown person, and she have all my information my personal details , telling me about she will send sheriff to collect my furnishers if i don't make payment today by 15:00, i don't understand, i have never received a call from her to explain the reason of this massage, and the lady is very rude and arrogant , she did not even ask if she is speaking to the right person or not ,not even protection my info , not following POPI act even to ask my name she just attack me , and say are you going to make payment or must i send sheriff ,