Check the rotor is mounted tightly to the wheel in line be with the species torque settings, then do a std alignment (loosen calliper mounts slightly, apply and hold on brake, nip up mounts, release brake, slowly fully tighten calliper mounts in small increments rather than fully tightening up be end in one go). This should fix the issue in most cases. If not take it back for a check in; if it’s a brand new bike you should not need to be replacing things immediately at your own expense because they are faulty.
