A reply to the love letter (about E90)

I understood it about the "terms".
However, this is gross negligence about the production of Nokia side.
Would you negotiate from you to Nokia?
In addition, I want to demand repair or exchange if it become the defect.
What kind of procedure should I take?

Please refer to it as follows.
「Background noise during phone calls, which raised customer complaints, was caused by a defective component in the microphone,spokeswoman Theresa Parenteau for Nokia Enterprise Solutions unit told」