Incorrect contract ,refusal to rectify

In July 2017 i upgraded my contract and inform the consultant that i need to stay on a top up contract.she inform me that i can have the Samsung S8+ for the amount of R749. 00. On the 01/08/2017 i checked just to find out i was on the wrong contract.After numerous calls to client services,upgrades,retention's nothing has been done.i have reference numbers,which found out was closed without any feedback or resolution. i have the names of all consultants i spoke to,and has been promised call backs which never happened,but ONE thing that works very well and they are very good in is to update your bill and add amounts,but when they have to correct it it a big issue. Im still not on the contract i asked for, and seems that nobody is prepared to assist.getting transferred from department to department,basically just getting drooped in the Que when they not able to resolve my issue