Account need to be credit since 2015

Ref *** dd 25/11/2015, ref ***6 ddf 28/12/2015, ref ***9, ref ***6 dd1/3/2016. My account should be credit with various R349-00 because of contract ended, Spoke to various people yet on 1/3 my account was still debited. Spoke to various managers and still not sorted.Got a lot of promises that some one in the back office will contact me. I am still waiting.... Instructed them to credit my personal account according to agent no such request was made. . Spoke to agent today in Durban and she instructed me that there is not a manager on duty only at 15:00. Well can someone please sort out this R1745-00. This service is really unacceptable