Customer Care not helpful at all

I have been having a problem with my emails. There is a certain company that sends me emails but I only receive it two days later and sometimes not at all. When I tried to inquire about this with the Vodacom Customer help line on 111 I was told that there is nothing wrong with my email and there is no IT department that I can talk to, so basically sorry for your problem, sort it out yourself. Who can I speak to that actually knows what they are talking about?