FNB connect

I have an FNB connect simcard. Ever since I got it, my calls drop, or the person on the other side can't hear me but I can hear them. I have to make at least 3 calls before the call is successful. I have logged a complaint on the FNB website and did not get any feedback. I called a call centre today and explained that I am not getting any feedback and the agent told me that she will get someone to call me back. I asked for a direct contact of someone that an solve my problem and I was told that they cannot give me a direct contact or any place where I can escalate this matter. When I insisted, the agent put the phone down. This has been an issue for the last 3 months and even if complaints are logged, nothing has been done to improve my experience with my FNB connect connection. Even while I was speaking to to an agent, the call cut, as usual, because of my connection and no one bothered to even call me back so I had to go through the call centre machine again to speak to someone. I have had it with FNB connect and the service that I have received and would not recommend it. I do hope that my feedback here would help me to get my problem resolved as I had no other choice as I was not being assisted going through any of the channels that FNB CONNECT was willing to provide me with.