High bill after upgrade

We use to be on the red advantage package for year since 2009 the amount payable use to be around R 1200 every month. Since the upgrade in Jan 2017 the amount differ from R 3 821 for March, April R 2 346, May R 1 494 which is the agreed payment, June R 3 340, July R 1980, Aug R 2672, Sept R 2 509, En during the night the payment for Oct... R 2 892. The amount now should be R 1494..... Who can pay these amounts without budgeting. After taking off work sitting in cues all day. Apparently run out of data or subscribe to wasp serves ..... We are done!!!! 6 months paying R 21 054... should have been R 8 964... Paying R 12 090 for who???????? We have Fiber WiFi all day so there is no reason that the data could have gone over or could phone more than 500 min during a month. This is absurd.... This is all lies....

Can Vodacom please fix this asap