Worst service ever

I app**** for an LTE router with cellc at first I received a faulty router on the 27.08.2018 and returned it to cellc on the 30.08.2018 and from that day I had to call cellc to see if the device was received a week later as I had not received any communication from them, I haven't had ant LTE connection on the sim card for the past 24 hours. I have been calling the cell technical team with no assistance at all, the service is terrible all they can say is that they waiting for the escalations and I have still not received assistance