Worst LTE and service ever

Got a LTE contract from Telkom last year. Received the router and proceeded to use the service. Had 5GIG during the day and 15GIG at night. Used a little to surf the net and day bundle (5GIG) was gone after three days without a big download taking place. Bought more data (3GIG) but got no connection. I tried using the \night"bundle but no connection. Struggled for days"