Poor Device Service

<p>My phone (j5 prime which I got on contract in January 2017) required an update and after the update, the phone stopped reading my SIM cards (phone has dual SIM feature). The phone was taken in to the repair center and it took 2.5 weeks to fix it. It has come back and only one SIM card slot works now despite them saying it was fixed. I am paying for a phone which is not working correctly and they clearly do not check devices correctly, yet at the end of the month I am expected to pay, even though the device is faulty. Please assist. I would simply like to replace this phone for a new one. </p>