Guys need some advice here,

Ok, i decided to change my ipx battery bfore my warranty end this month 2 weeks ago. Sent my ipx to my nearest service centre at kk, sabah. Got a whatsapp msg from apple on friday , saying that my replacement unit is ready to be collected. Replacement unit has 3 months warranty.I went and collect on saturday (24th november) without checking bcoz i was in a rush. Reached home and decided to pop up my sim card and to my dismay i noticed there is a dead pixel on the left side of the screen nearby the volume rocker. I went to the service centre again today to return my replacement unit. The technician checked and found out that the unit was tampered (battery tape missing, psa stick to another place). Due to this i cant proceed with the warranty replacement. The service centre asked me to call apple care to escalate this problem. Called apple care and this problem has been delegated to another department. Again leaving me waiting what will be their decision be, either give the green light to replace or not. What is the next course of action should they decides not to replace? This is my first iphone and apprently this is the first time the service centre experience this issue. Really worried, frustrated and confused now.