Horrible service and false advertising

So, been looking for faster internet at home. Done my research, checked coverage maps, confirmed with online consultants etc, and even confirmed in store that I am covered for LTE-A. Get my sim card sorted, load data etc etc and good to go. Connect last night, the speeds are horrible. I then switch to my cell phone which I know is LTE-A enabled, the network only connects to 2G. Now, I am thinking the sim card is not LTE enabled, as I know some networks have different sims. I hit up the "Chat to us" option on your website and get connected to Londiwe. She is not helpful at all, telling me that 10MB download and 2mb upload is correct for LTE-A and that there must have been traffic. She then wanted to check coverage and said she couldnt, so she cant help me. I told her i have checked a thousand times that there is coverage, so she should advise me what to do. She rudely just ended the chat! This is not right! First, i waste my money buying a service you are unable to offer to me, then, i get treated like **** when I query it?