Telkom LTE-A

Good day We had a problem with LTE speeds on our B315 router, Telkom sent someone out to come and sort the problem out but all they did was move my router. so then I went to the Telkom store and asked if I buy the Huawei B618s-22 router which supports LTE-A will it work in my area to connect onto LTE-A so that I can experience greater speeds. She rep**** yes and checked my area for coverage which I was in coverage. then i went and bought this router for R3000 inserted the sim from the B315 router into the new router. but now it stays on LTE only and never goes to 4G+ (LTE-A). Phoned the 10213 nr and the consultant said no i should go to instore so that they can activate lte-A for me....... I went to the store and she said to me that there is nothing to be activated it should just work automatically. Phoned 10213 again after this visit and now she says my sim card does not support lte-a i must go to the store so they can help. So really I don't know what to do anymore..... I get to the store and then they tell me there is no difference in the sim card.