Sounds like terrible service and I don't think it's the first time
they've been criticised on here, is it?
But all their contact details are fairly easily accessible on their
website inlcuding the phone no:
http://www.plumbworld.co.uk/info-2

As far as I knew, they only offered email as their contact method
these days - perhaps they've had so many complaints they've had
to put it back in...

I'm a previously very satisfied customer of theirs, and have
recommended them to numerous people over the last 18 months - I
was just shocked by how bad this purchase went.