Inconsistent connection

I’m based in Bloemfontein and I’m on 4G uncapped data package. I’ve used this service for about a year now. Everyday between 16:30 and 22:30 there’s so much interruption with connectivity, speeds decrease from about 9 Mbps to around 2Mbps, one can hardly work with such speeds. Please make an effort to fix this problem because I’m really considering canceling my subscription and will not recommend your service to any one.