No Back Office support

I was phoned by call center Marvin on 8 December 2014 informing me that I was still on old package with 50 Gig soft cap data and that I can change to uncapped for a cheaper price total being R 579 compared to current account of R 600 Reference given ***. After week went by and nothing happened I went to local branch in Herm****. I was helped by Bratleight and internet was changed to uncapped, January account had lots of debits and credits and total was R 632 I presumed it was due to change over calculations during the month. End of January my internet speed was gone I did data usage check and was shocked to see I was on 20 Gig soft cap. Again went to local branch and was helped by Verne who online changed data to uncapped. My accounts for February and March are R 796 and R 825 respectively. Today again went to branch regarding monthly accounts Verne said changes was made by call center referring to Smart home advanced package. I never asked for this. He could not solve my problem and said he put in a query to account department. Can someone please sort out this mess and deliver to what I was promised by Marvin..