You need to approach this calm cool and collectively but go into it with the mindset that they will in fact replace your parts even if they don't want to or have to. If one rep won't help you then escalate the issue to their supervisor and so on until one of them wisens up and replaces it.
I'll tell you my recent RMA story to help you pass the time; I had purchased a refurbished Logitech K800 keyboard from one of their third party suppliers Canada Computers, it arrived dead I couldn't use it at all just get a flashing red light where the charge indicator was so I didn't panic. I called their CS and the had advised me to change the batteries before doing anything else (this was a mistake there was no record made of the call). After changing the batteries to some Duracell NiMH batteries ($8 a pair) as directed the keyboard worked and I was content, 1 month later the batteries wouldn't recharge at all, I was getting the same flashing red light. So I decided maybe I left the keyboard on and it was my fault so I went out and bought more batteries, Not even 2 weeks later I go home and turn the keyboard on ( I was sure to make a point of turning it off when not in use) and I got the same error. I called Logitech and started the warranty process which came to abrupt halt when I told them it was refurbished, apparently they don't warranty their refurbished items according to their CS supervisor that's why they sell them cheaper... I calmly told them that someone was going to replace this board weather it was the retailer or themselves because it was their CS that told me to change the batteries instead of sending it back to the retailer. Logitech told me to contact the retailer and respond to an email they were to send me with their response. Well the retailers response was pretty straight forward "Sorry this item is past it's 15 day return date". So I sent that response replied to the Logitech CS email and waited 2 days with no response (don't ignore your customers).
~intermission cue Monty python music
I called Logitech back and explained the situation they pulled up my case and went into the whole speech about how they don't warranty refurbish, I politely asked them to show me where I could see this policy in writing for myself which they could not do. I got a little upset because this was the final attempt and I knew it so I said in a firm voice " you had better get your supervisor on because it was your technical service reps that told me to change the batteries int he first place when I should have just sent it back to the retailer" she asked me to hold on a couple minutes while she got one on... 3 minutes later she came back on and stated they were prepared to replace my board.
They just wanted to get rid of me because they didn't even ask for the faulty board back just a shipping address.
If you feel like you didn't do anything to cause the situation then you are entitled for someone else to be held responsible, these companies are wise to the fact that sites like OCN show up on google search and facebook and twitter can be just as good for resolving issues out in the open as it is for marketing and sales. Don't forget about these new valuable tools that we have at our disposal now but use them fair.
Cheers and GL with your issue, it would be wise for them to replace everything damaged if it was infact not your fault.