Bad bad service

From day one that my Mtn fixed LTE was activated I had problems with the service.. My speed stayed between 2 and 3 mb and when you called or whatapp and tell them the problem thy just through in your face there TC&C so what I did was installing the router outside my house in a enclosure but there was no change at all, so a placed a mast 4m above my house and installed the router on it with nou change at all.then a installed a signal booster and no change at all, so I decide to buy a new router and placed there supersonic sim in to the new router and created a supersonic APN and gues what the speed went from 2_3mbs to between 27 an 30 MBS but unfortunaly its not a Mtn a proofed router so thy blocking my router.. And when I contacted supperonic and want some explenation thy just ignoring me or tells me you have to u have to use the supp**** router