Bad service and doesn't know the contracts

I upgraded 2 weeks ago at the MTN Brooklyn branch! I showed him my previous contract and told him that I want more or less the same because this is my business phone... We'll need less to say him told me that 500min is more or less the same as 750min and that I will get 1G data with my contract and I will pay for the other 1G! He told me that I have to phone 808 to set up the other 1G, because he struggles to load it! Well I phoned 808.. Just to find out that I cannot load another 1G, because that is not allowed! Now I am stuck with 1G data on a business phone and I today is only 21 May! How did he think will I survive the rest of the month without data and what will I have to pay for the exstra data I will use during the rest of the month!!! I am dissapointed that people like that is working with our contracts and that the service of MTN in the whole is busy going down! Sometimes I drive through the mid areas of Pretoria and I have no signal... How is this possible! I will definitely be calling other suppliers like Cell C or Vodacom and hopefully receive better service overall!!