Pathetic Service from Vodacom

I have an open serve home fibre with vodacom since last year and around February i app**** for relocation that was done at some point i wasnt sure if they debiting monthly premium i phoned in and i was told they do as i gave authorization if wasnt so they would disconnect i took their word.. To my surprise i just got an invoice of R2656. 10 im told they have not been debiting the account from April reason i dont know now i must pay R2700 how on earth whose problem is that in these difficult times.