Highly disappointed and frustrated

I took out a contract with Vodacom end of February for an Alcatel link hub cat7 wifi device. Since I got the device it has been more to the voda repair shop then it is at home. I took it in to the repair shop about three weeks ago as it was not picking up signal and received a message to collect it on 26/04.I collected it on 27/04 got home and plugged it in only to discover the WIFI key is invalid, returned it to the voda repair shop yesterday on 01/05 and will be waiting to hear from them, hopefully it will not be another three weeks. I am basically paying a monthly payment of R399.00 for something that spends more time at the repair shop am not using. I am very disappointed in Vodacom; I even called the Call Centre where the consultant advised me to switch the device off for 30 minutes then on again to see if the wifi key will be working and that he would call me back to check in which he never did.