Billing Issues not resolved

MTN ***<br> Mobile Numbers: *** and ***.I used to be a Nashua Mobile customer. November our accounts got changed over to MTN when Nashua Mobile went out of the mobile business.For December my billing was perfect.For Jan, Feb and Mar it is incorrect.When I signed my contract with Nashua Mobile I signed it so that the data is capped at 2GB. I do understand that when a session runs over that there is additional cost but that is usually minor since the ipads are set not to download anything over 100MB,automatic updates are disabled.When MTN transferred the accounts they did not load the data limit on their system. I spoke to customer service and she did confirm that my contract states that I have a limit for R20.She mentioned again that if a session runs over that it is my responsibility and I said I understand and if they can send me the detailed billing I can see where a session ran over the 2GB and i know what I am responsible for. They never sent that after numerous requests.U will see on my bill that I am even billed for Bill Limits - R4.82 per month. But they do not apply this.For JanFebMar excess data costs for R8298.84. taken by debit order.