Pathetic service

Worst company ever I received an invoice of R612.07 with no explanation from telkom I signed up for their 80 gigs wifi capped 40 gigs day and 40 gigs night time the charge is R379 a month which has been debited off my account every month I queried the invoice amount via Facebook which is an absolute nightmare I was then told I went above what I was capped for, I asked how is it possible when my contract says 80 gigs CAPPED i didn't receive any response i then went to telkom at the west gate mall branch where i spoke to Kelebogile who then said whoever had signed me up didn't cap my wifi to 40 gigs night and 40 day instead it's at 50 gigs and I am asking whose problem is that? We then tracked our usaged via the app and there is no proof of us using more data than signed up for. I went over to checkers and paid the amount I normally pay today I received an invoice of R1189.07 i have no idea what this invoice is no one has even bothered contacting me telkom has been ********ly debiting my account.