[mothered]

What can I do in this situation?

Stubborn reps who couldn't care less about the seriousness of the events that took place, will Inevitably come around and make things difficult.

Lenovo has an Escalation team for unresolved Issues, which Is as simple as completing a form with the description of your Issue. I suggest mentioning every event you've described and In particular, the rep's rudeness and how he mistreated you personally for such a sensitive Issue that should've been dealt with the utmost of care and concern. 

Also mention that you've been emotionally Impacted as a result of the mistreatment.