LTE Connection

since the 21 February 2015 I can not connect using LTE only 3G. I have been calling the Mtn contact canter for help where I have been sent from one department to the other. on the 5th March I talked to a guy from their data department who transferred me to someone else and told me to tell the next person to remove LTE and load it back on my profile. The guy I found had issues performing this and loaded a call for me which was never attended to. I called again on the 6th twice and the call centre agent remove the LTE and reloaded it but this never helped ad I still can not connect using LTE. I use an iPhone 6 plus and I am finding 3g to be very slow when I am on the internet. I am tired of calling the contact centre because I am not getting any help and for the past 2 weeks I have been calling for the same issue. every time I call and hear the ad of LTE and how fast it is I get so irritated because their LTE is clearly not working. I a