Is this right??

I bought two Beats Studio 3 headsets about a year and a half ago from iStore. The tiny little brass ***** that hold the hinge onto the headband fell out and disappeared. After having to book a technical assistance slot, the iStore took the headset and sent it to have a new tiny brass ***** fitted. Today I get quote for over R6000 to fix this problem. When I phoned in for clarification, I get told that Core Group does not have this tiny ***** as a spare but I must now buy a completely new headset!! The headset works perfectly, but because they don’t have a spare fir this tiny little brass *****, I must pay up over R6000 for a new headset? Come on, how can this be moral or right? I’ve tried calling snd WhatsApp’d management but got cut off and receiving no empathy or understanding. Just pay up to but a new headset because of one tiny little brass *****!!