Poor service from MTN regarding mychoice sim-only contract

I took out a contract online for 30GB day and 30GB night, to my surprise MTN keep loading an incorrect data in my sim, since I took out a sim-only contract in august. I have been calling mtn since the 16th December(spoke to Xolisa:REF:***,18 December spoke to Penelope,Zanele and Slindokuhle: REFSMC/***, on the 21st December spoke to Xobile REF:***)I went to mtn outlet at The Glen mall on the 23rd December and a query was logged:REF:*** and I'm being sent from pillar to post. I send an email to their complains dept. on the 24th December and did not receive any help. I received emails from Lesego Nkosi(couldn't help me),Musa Nzolo (couldn't help),Gladys Ramarumo (couldn't help) Hellopeter, please help me to get my data as per my contract and I would like to have the recording when I took out the contract since mtn never sent me my contract as per our agreement over the phone. I'm very unhappy with the level of service I'm getting from mtn when I'm paying them without any problems. My details are as follows:A***,my contact number is ***.