Very disappointed with the Service

I have been having issues with my Vodacom for a few months. I have been a Vodacom customer for years but somehow they cannot fix my problem. I cannot hear the person on the other end of the call when I'm in certain areas. Which does not help me at all cos I have missed alot of calls. I went to Vodacom for help on 3 different occasions, first I had to do a sim swop which I did, did not to work. The following week they did a network setting, still did not work. The 3rd I went I was turned around at the door saying no one is currently there to help with the problem. So I decided to port my number from Telkom to Vodacom as I need to be able to take my calls as I work from home but do not want to loose this number. I did the port at Telkom but because my Vodacom network is not working properly I got the message that I need to confirm the port long after the 40 minute deadline. I have been on the phone for almost a day trying to get through to the Customer Care Centre. Call just get ended, not giving you an option to hold. The self automated message says they are busy with high call volume and they give options but no options are for me. So then the call get cut from the other side. This is not acceptable. I could have a family emergency and cannot get through to me due to Vodacoms problem. I need this issue resolved as my livelihood depends on this.