What warranty... We had 5 windows replaced with Os...

What warranty... We had 5 windows replaced with Ostaco. Windows are great, however the outside paint around the windows have faded (Sandalwood colour gone)! Sales rep (Ken Macpherson ) visited, took pictures and responded 2 months later after repeated emails to both him & head office - nothing they can or will do about it. Our less expensive Northstar windows upstairs have not faded at all. Guess we need to replace rest of windows with Northstar!! :-( Thanks for your instructions to email admin@ostaco.com... which I did 3 days ago, and still have not had a response!!