Poor costumer service

My phone that I purchased in March 2009 recently stopped working. I called customer service and they went thru a list of questions, and referred me to my closest T-mobile store for a new SIM card. I went in, they replaced the SIM but the phone still did not work. They explained that it was under warranty so they sent it back in, and replaced it. They went over the warranty and I signed to send the phone in. They replaced my non working phone and I thought that was it until I received a letter saying that their investigation showed that my phone had water damage.

SECONDARY water damage. So I'm now responsible for a $100 warranty fee for a $69.00 phone. I was not at any time explained that I would be held responsible for the warranty fee of $100 for secondary water damage. The cusotomer service rep explained that this could be condensation that built up in the phone if left in the car.(I live in Arizona.) I feel this is very poor customer service and no one is able to help with this at T-mobile. They will not give any phone numbers or e-mail addresses for someone who might be able to assist with the situation either. This is the policy! Now do you really think I would send in a $69.00 phone Knowing it had water damage and I was going to be charged a $100.00 fee? Who are they kidding?