They just deleted 10 active SIM cards, nobody knows why!!!

I use prepaid SIM cards for my vehicle GPS tracking, with 10 cards that I recharge with data every month. At the beginning of this month, Vodacom deleted all my SIM cards from their system, even though they are used daily. They can't explain why it happened or who was responsible. Their only advice is to buy new ones, which is incredibly unhelpful. Their incompetence is absolutely infuriating!