LTE not connecting

I ordered the month to month R269 LTE which I received on Monday. To my surprise when I plugged in it was not working, I visited MTN at Illanga mall in Mbombela and after they verified that it was active, they gave me a number to call that ends with 1212 because they said the problem was network, I called the number from 16h30 as I was told they close at 17h00, I was advised to take the SIM card out of the router into my phone and back to the router later, it didn't work. I spoke to about five agents without success and these calls lasted until 20h00, the last agent said the router needs settings so I should go back to MTN and ask them to call them. I went there in the morning and after some hours they said it was the SIM card that was not working and needed to be swapped, I was referred to another branch at ABSA square. When I arrived I was told I couldn't be helped because someone opened a job card that was making it impossible to assist me. I left the router at the branch with a sore heart and frustration since I purchased the router to assist me with my studies. This has been the worst experience with MTN, such a big brand sending it's customers from pillar to post for giving them business.