Was it just title, or did you not get the money originally offered? Is your role not the same as they said in the interview?

Deep down I would have a trust issue with the company. Although often titles are handed out as fake promotions and have little meaning. Senior developer vs junior analyst vs architect. They all sound different but could be the same job as there are little / no laws regulating titles.

Do you enjoy your job? Do you like your pay? Depending, I would start shopping your resume.