Afrihost done it AGAIN!

I have contacted afrihost several times to resolve my companies email problems. Our emails on several computers repeatedly stop working. This problem has been ongoing for years, has taken place in several provinces and different internet providers. It has NEVER been resolved. I am tired of taking my attention away from real problems in my business to deal with afrihost's inability to follow through on the service they've committed to. I wish their CEO could be let down by his service providers as much as he has let us down. Useless