Telkom business: Horrible ISP service

If you make use of a Telkom business email address (@telkomsa.net) be warned: We (a veterinary practice) have had a full week of not being able to access any incoming mail. Ten hours on a phone (with many reference numbers) an many emails (to all Telkom email I could find) I still have to hear: 1) "Web access to Telkom mail has been having having problems for the last week and we are working on it" or 2) "because your Outlook is *******, you have to reinstall it and everything will then be working 100% again". We can work without Outlook in the short term (reinstalling is a massive job and and I am convinced it will not sort out our access), how long is "acceptable" for Telkom for us not to have access to our mail through our the web? One day is already a critical problem for us, one week is a total disaster! Telkom is surely the worst ISP option in the market and any business should consider limiting it's exposure Telkom services to 0%. My research shows Afrihost is top on service on most ISP lists, not surprised to see Telkom at the very bottom!