Warning Light On problems of the 2013 Tesla Model S

My Tesla has had multiple issues related to the airbag system. The first issue was that a seatbelt sensor tied into the airbag system failed due to a pinched wire in the seatbelt mechanism, causing the srs/airbag warning light to stay on. To fix this, Tesla replaced the seatbelt latching mechanism and charged me for the replacement. Shortly after, the warning light came back on. This time, a seat sensor tied into the system failed. Tesla has told me that to fix this, the driver's seat must be replaced, and that I must pay for it, a $2500 bill. I was further informed that it would take 4 to 6 weeks to order the seat, during which time the airbag system would remain non-operational. At the moment I am refusing to pay for the seat, so I'm driving around with a disabled airbag system. I feel that Tesla should be fixing such defects free of charge.