Hi Gerald
Sorry to hear about your filter.
I had a problem with a lost mobile phone from Ebay once and after two or three days of stuffing around from Australia Post I shot a letter of to the Postal Industry Ombudsman,
http://www.pio.gov.au/index.html and low and behold if my phone wasn't mysteriously delivered within 48 hours of receipt of the e/mail and I received an apology to boot. After all the phone was travelling all the way from Homebush to Mascot.
Good luck with sorting it out and please let us all know how you get on.
Regards
Wayne