No connection after upgrading

I recently decided to renew my contract with a data package, so I went into Mall of Africa on the 25/08, cause thats where I did my previous upgrade and it was quick, they staff were extremely helpful. This time however, I got helped by one of the least friendly people I've ever had to deal with, he sat there the whole time, didn't engage, wasn't interested at all, it was like I was wasting his time, after what felt like forever of silence, I was finally done and out. The Sim is with my father, so I phoned him to let him know I changed the package and couldnt get through, assuming it was due to the upgrade, I had phoned him on this number while I was in the store to let him know what I was doing, and it had gone through then. A week later and there's still no connectivity, let me emphasize this inactivity of the Sim happened immediately after 'upgrading'. So I went to ****arney on the 02/09 to see if they could assist, nope once again, completely unhelpful staff, she wanted to see the Sim, which I didn't have, offered no other solution, so I asked to do a Sim swop. 2-24hrs later, nothing still no connection, I emailed the customercare email, got a reference 779893, on its now the 07/09 and still no response. I went to the Northgate branch, the checked the Sim and tell me that they can't do anything the Sim swop wasn't done properly I have to go back to kilnarney to sort it out, once again there's nothing they can do. At which point I'm beyond frustrated, how is mtn not linked? Are you not one company? And on top of that I see the same package is now R50 cheaper, which wouldn't bother me usually, but now I've been sitting for 2 weeks with a Sim that doesn't work and an upgrade that obviously wasn't done correctly, or something was messed up somehow and no one can seem to help me. When I told her that I have another contract due for upgrade, but after this service I'm definitely not renewing, mtn service is pathetic, she said well there's nothing she can do, if I feel mtn service is bad then I must leave... So if I leave like the other 2 million people that have already left mtn, it makes no difference to the mtn staff they are getting paid by the fact that mtn has paying customers. I'm beyond upset and have no idea what to do now cause it just feels like I'm being pushed around and no one can help me.