Once again back to stone age

I arrive at work today and switch my ****le on as I do everyday. I have noticed that the internet speed and connectivity this week so far has been absolutely atrocious. Today I cannot download my emails because my internet is running at stone age speeds of EDGE. What is it with Vodacom that their network is so unstable? If this problem is occurring because of maintenance to towers or network then why can it not happen after working hours or at least notify us of interruption? I cannot work without communication and once again we paying for a service that we do not receive! I have done all of the necessary steps to reset my router as well as my computer multiple times and still EDGE! Please fix this!