Vodacom *****ing my data!!!!!!!

I’ve had near on 2.5gb of pre paid data vanish. I’ve run the data usage feature on my Vodacom app and this confirm that of the 3gb purchased only 555mb was used since my data purchase on the 26th March and suddenly the balance is gone. I’ve been forced to purchase another 3gb today which was a total waste of funds especially when funds are so tight with Covid 19. I want my data back VODACOM as well as an explanation as to why you’ve stollen my data.