As the OP states this is a 2016 model, I doubt any dealer would take it back. Similar to an earlier post, I have two suggestions if this is not possible, neither perfect but should Help bring the cartridge back into vertical alignment :
1. Partly unscrew the 3 arm mounting screws & temporarily remove the LH inward one. Try sliding a thin washer between the arm mounting & plinth at this point, push the screw back through & gently tighten all 3 again. If this doesn't Help straighten the arm, then maybe try a small rubber washer so that as you tighten, the arm has a small amount of adjustment. Be careful not to repeat this too often so you don't enlarge the holes in the plinth.
Use an accurate bubble level, also checking it against the platter so both headshell/platter will be horizontal after adjustment.
2. Discard the third cartridge screw & glue with something removable like Pritt-Stick a thin strip of card front-back along the top centre of the cartridge (maybe 2mm wide x the length of the cartridge).
By carefully tightening/loosening the two remaining mounting screws, the cart can be made to tilt slightly L or R in the headshell - a method I have used successfully for azimuth with Rega arms in the past & easier than fixed shims which do not allow fine adjustment. Obviously the bubble level will be no Help in this case & this also depends on the OPs abilities to re align the cartridge accurately without the Help of the 3rd Rega screw.
edit: why does the word Help always change to a capital H when I've typed it with a lower h?!