OK- so who can help me write a complaint letter to Honda Customer Service

About a month ago the car ( a 97 Passport) started dying 'n flight'. Had it towed to a Honda dealer. Both they and AAA said nope not the alternator( which is what my teenage son thought it was) - you need a bigger battery to run this aftermarket stereo ( which had been running fine for 6 month .

OK- bought bigger battery. Car dies again about a wk later. Back to Honda - Service dept keeps it 2 days and tells me these gold things are shorting out the battery and disconnects entire aftermarket stereo system,because they wont work on them. Well you guessed it - next day dead car - wont even jump start. Back to Honda ( I've already been told how stupid I was to bring it back there so we can leave those comments out of the replies please

Now of course they say it needs a 600 dollar alternator.

I know what I want - the cost of the alternator that they probably broke and what it will cost me to have the stereo system reinstalled. Is this reasonable? How do I ask? And I dont even know if the car was fixed as alternator is just being put in today and I am , of course, not in town

All input appreciated