Wifi router terrible device

My Wifi router keeps giving me problems and defeats the purpose of saving any money monthly on my phone bill. The reason i got the router was so that i could save on data on my Smart S contract, but my phone just does not pick it up so i am unable to use the data i am paying. this means i am spending even more on my cell bill on data. The issue of not being the master account holder and the schlep it is to buy a new bundle stops me from actually phoning in to buy top up which again defeats the purpose of getting the router. it often disconnects on my laptop and home pc too and then i have to restart and reconnect. i had to phone again last week to buy yet another bundle on my phone contract, and the lady misunderstood me and migrated my data package, which means i didn't get the 250mb data bundle and now running up data cost ONCE AGAIN! i was hoping by buying the router i cd limit my acc to paying R389 plus R129 = R518 each mnth and now end up paying more than R700 p/m. I would like to know if i can cancel the router contract or replace it so it actually works and not cost me extra to have.