I never have before (but then I've never had a problem before!)
I bought a turkey baster before Christmas - it arrived, looked fine, I was happy. When I used it, it melted. I emailed the seller to tell her - it's an ebay shop so it's not that she had one and never used it, iyswim, although I was giving the benefit of the doubt and assuming they probably didn't know it wasn't fit for purpose (perhaps they should advertise it as suitable for procreation purposes ) - I've received no reply and it has been a fortnight. I didn't expect a refund but a small apology would have been nice!