Data usage through the roof

i need someone to help me ASAP, Never have i had an issue with data usage, Yet my account is almost at R2000 for Data, please tell me how do i run up almost R2000 data usage in just a few days, when all my apps have had the Background data restricted, and my phone has the data limit on. i have checked and re-checked my phone and all is in order. so vodacom check your systems, this is incorrect, none of the dam call centres have been able to help, which is useless then to have a call centre. i need answers ASAP. there is no ways in hell that i would have used Almost R2000 worth of data