Acer 'support' - advice needed

Our company bought 14 Acer TFT monitors late last year. We had to send one back for repair due to missing pixels. They received it on 11th November - we still haven't had this repaired or replaced. The status on their system has just changed from 'awaiting parts' to 'awaiting replacement', but the helpdesk guy told me he would expect it to be another 4 weeks before we had a replacement.

That's a turnaround time of approx a quarter of a year!

I documented the full story of this (so far) at http://bleepend.blogspot.com

Their 'helpline' seems to be no help at all. Is there anything else I can do to speed this up at all? Do we have any legal comeback or do we just have to lump it?

Thanks.