Pathetic service ever

I did an upgrade with vodacom I think on the 12 of August and I was assisted by the guy called Brian from cancelations dept. I upgraded to no device deal with 20GB on a 90% discount 250 minutes and R70 airtime, the guy confirmed to me the same deal about 3times.But later I noticed that he activated 10GB instead of 20GB the I called the next and I spoke to Nompilo and she assured me that it's sorted out on the 1st of August I'll get 20GB instead of 10GB.on the last day of the month I called again just to confirm and I spoke to the other guy who kept me on hold for almost 30 minutes then dropped the call and never bother to call back. I then called back and Spoke to Siphamandla and I told him that I wanna speak to the manager because the consultant kept me on hold for too long and the drop a call but he insisted that he will assist me then also kept me on hold but he came back to me and told me that it's done already on the system, come the 1st I'll get 20GB and I then ask him if I can speak to Brian a person who did my upgrade. He said Brian is sitting next to him but he is currently on a call but he will give him the massage to call me back and as I suspected Brian never called me back. I'm so frustrated and ****ed that Brian after getting an upgrade from me he never even bothered to fix his mistake that he made on that upgrade. I want this matter resolved ASAP