Very poor or no internet service during the day

My mobile data has been extremely bad for the last 4 weeks. I have tried everything from my side. Tried a new modem, a new sim card, spoken to customer services, had long discussions on twitter, I was promised i would be contacted by network services. My internet went bad overnight, very slow, sits on edge or HSDPA much of the time, no service at all for hours in day, even when its on supposed 4G it takes 45 minutes to upload 100Mb which used to take 5 minutes. I use this for business. I cant use it like this. Its embarrassing when I cant reply to my client for an hour via email, or keep him waiting for a file for an hour. What is going on Vodacom???? I know its not a problem on my side because it is worse during peak hours from 6 to 9am and from 4 to 8pm, there is no way that I could be responsible for that. Also when I have no internet ny phone signal drops to 1 bar, this is clearly a problem on your side. Please sort this out. I am tired of begging and pleading and fighting.