Signal problems

I logged a complaint with Telkom regarding my LTE connection issues. I have had it a few months now. in the beginning it was pretty good. then 1 day it just went all south. Signal strength on my router just dropped from between 3 & 4 to 1 & 2. Since then I continuously got erratic network response. Speedtest went from 20 ping 19meg download to 35 40 ping & 5,6 or 7 meg download. Telkom was at my house & said I needed to buy a LTE-A booster. first of all, When I bought the LTE I was told that I must get the normal LTE router & not the LTE-A router as the LTE-A router would not work because of no LTE-A coverage. When I got ,y router I was told that the booster I use on my normal 3g router would work fine on the LTE router. It did. The signal was boosted. After some time that the technician was at my house, I have not had any more feedback regarding it. I was told I would receive some feedback. Now on my current contract I have the 50GB cap contract. shortly afterwards Telkom released a different contract for the same prise but with additional 50GB midnight cap. Now why on earth would you want to do that, & then amend the other contract to also have the 50GB midnight cap?