Unexpected Technician Visit

Good day, I would like to ask if meron ba may the same experience na randomly may unexpected na technician visit?

PLDT subscriber kami since then and walang attempt to change ng service provider. Pero randomly may nagpunta na taga Converge at sabi migration daw yung gagawin, yet wala naman kaming request. Although may van and equipment sila na usually ginagamit sa pang maintenance. Curious lang if meron na bang ganong system ngayon sa mga telco?