First step that you should take is to verify if they have really updated the BIOS for you and what version of the BIOS are you having on your system.
Open command prompt on you computer and type following command:
wmic bios get biosversion
Compare the version that you have installed on your system to the latest version released by Dell.
For Alienware 15 R2 systems, latest version is 1.7.0 (indeed released in May 2019).