Extremely bad service

So i got a LTE router from Telkom Keywest it work for a while then it stopped took it in and they sent it in for repairs so they say..... it came back i got home and guess what it still had the same issue.... i took it back the same day and it was booked in and now i get a phone call telling me that it is still not fixed and will be sent back for the 3rd time!!!!! i have not even used it for a month why is it that i must pay for something that has been at the store than what i have had it for????? PLEASE JUST GIVE ME A NEW ROUTER IS IT THAT HARD?????? I am extremely upset as the loan unit is not what i am paying for i am paying for a new one but i have not been able to use a new due to the ****ty service i am receiving!!!! I hope this gets sorted out very soon as i will take it up further.