Disappointed new client!!

I app**** for a telkom lte uncapped router and received it the sales consultant assured me dat im able 2 connect numerous devices..i know the there will definetly be some issues which connection but my connection is constantly buffering i just added 2 devices and already it says maximum devices connected ..i try and communicate wen thw sale was in the process they communicated fine but now that i need help i receive no joy ..now i want to cancel coz im not getting any joy here and it's only 2 days and already regret it