Overbilled for Cell C errors!!!!!

Ive got a Cell C straight up 200 account with a added 1Gig databudle<br> <br> The costs therefor is R220 + R149 = R 369<br> <br> My December bill amounted to more than R900!!! and Jan 2016 Bill more than R700!!!!<br> <br> This is insane and an error on Cell C's upgrade department<br> <br> As per my previous complaint - Cell C did correct their error and have loaded the ! Gig bundle since mid Jan - but HAVE NOT CORRECTED THE account!!!!<br> PLEASE CREDIT MY ACCOUNT ASAP<br> <br> Also - I have asked that the data bundle and straight up be capped - and due to bad service Im worried that this is not the case - PLEASE CHECK AND CORRECT IF NECCESSARY