I suspect that they have not replied because they misunderstood what you ordered. Now having looked at it again they probably realise that they have kocked it up and are hoping that if they ignore you they will go away.
Did you pay by credit card? If so you could ask your card company to intervene. Explain that the goods they have supplied are not what you ordered and they have not responded to your contacts.
You could also look and see if they belong to any commercial bodies - chambers of commerce etc and complain to them or trawl the internet and complain to their local 'Trading Standards Office' which is a Government body charged with keeping business honest.
The 'Eathen in his idleness bows down to wood and stone,
'E don't obey no orders unless they is his own,
He keeps his side arms awful,
And he leaves them all about,
Until up comes the Regiment and kicks the 'Eathen out.