worst service ever, very poor

Dear HeloPeter, MTN agent called me to offer me LTE simcard, when I asked hows that going to help me, he said its going to help with fast data connection, but ever since I changed to LTE simcard that he delivered to my place, signal has been nothing but nightmare for the past 2 weeks, I restart my phone more than 10 times a day whenever it loses network. I called 808, spoke to Vincent and what he said was SA doesn't have LTE, my Question is why would they give me something that doesnt work? He then said he'll restart my connection from his side and must give it 24hrs, 24hrs came & went, I called again spoke to Daniel , who said he'll log a call for me for my number to be changed back to my previous 3G simcard, that was 9th April, I called again Saturday & spoke to Mpho, i was even stuck by my complex gate because I need to use the phone to open the gate, i had to use my sisters phone to call 808, even Monday I spoke to Mpho, all they do is empty promises, please help, I think I lost my patience with MTN, they don't understand I could have been hijacked by the gate because my phone didn't have network, so I couldn't open the gate, even now sending this message it's bad