inconsiderate

i booked my device for repairs and i was told that no fault was found, so i have been without a phone for over 3 weeks and i have called a twice to ask them if they are sure the device is fixed they said there was no fault to begin with, so now my question is why would i say my device is faulty when it is not so i can be phoneless for all this time? i have been made a fool because today i went to collect my device and guess what? the same device they said has no fault is still doing the exact same thing i booked it in for, so what must happen now because i was patient for all this time. we called the repair centre and was advised that the issue will be escalated, how does that help me because i need my device and i cant wait another 3 weeks and mind you, i am still paying for this device which means i am paying for something that i am not even using. i am now forced to take up a new contract because i cant not have a phone because i do not have a secondary device and i have missed out on a lot of things especially at work because i am unreachable, the other device is set to me delivered sometime this week so now who is going to be paying for this device now once it is fixed? i am supposed to now spend money i should be using to meet my family needs on a device that i wont even be using since i cant use two devices while i only have one number, so this is a huge inconvinience for me ao i am asking that its either the issue is sorted before the end of this week or you pay off the contract and keep the device because i will have no use for it.